Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives...
Transcript of Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives...
![Page 1: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/1.jpg)
Let’s Subtract Big Numbers
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Today we will be… Solving subtraction problems involving
money.
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![Page 2: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/2.jpg)
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Mental Oral Starter
What is the total of these coins?
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![Page 3: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/3.jpg)
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Mental Oral Starter
The total is 82p!
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![Page 4: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/4.jpg)
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Mental Oral Starter
What is the total of these coins?
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![Page 6: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/6.jpg)
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Mental Oral Starter
What is the total of these coins?
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![Page 8: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/8.jpg)
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Mental Oral Starter
What is the total of these coins?
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![Page 10: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/10.jpg)
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13p
I have this much money. I’m buying one teddy bear and want to know if I can afford one
more. Write the subtraction calculation you will use to help me work it out.
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![Page 11: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/11.jpg)
13p
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Can you use partitioning to help me solve it?
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![Page 12: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/12.jpg)
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Begin by partitioning the numbers. Now cross out the number of tens and ones you are taking away. Will
you need to exchange a tens counter for ten ones?
10 1
10
1 10 1 1
1
10
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![Page 13: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/13.jpg)
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Yes! We need to exchange. One tens counter will become ten ones counters. Once we have crossed out 13’s worth of counters, what is left will be the answer.
10 1
10
110✘ 10 1 1
1✘ ✘✘
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![Page 14: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/14.jpg)
1
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Did you get the answer 19? That means I can afford another teddy
bear!
10 1
10
110✘ 10 1 1
1✘ ✘✘ 1
1 1 1 1
1 1
1 1
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![Page 15: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/15.jpg)
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28p
How much money will I have after buying this cupcake?
What is the subtraction calculation you will be solving?
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![Page 16: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/16.jpg)
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Partition the numbers and cross out the tens and ones you’re taking away. Will you need to exchange for this
calculation?
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![Page 17: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/17.jpg)
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Did you reach the same answer? Well done! I would have 37p left after I
bought the cupcake.
1
10 1
10
110 10 1 1
1✘
1 1 1
1 1
1
1 1
1 11010
10 10✘✘
1
1
1
1 1
1 1
✘✘ ✘✘✘✘✘
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![Page 18: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/18.jpg)
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45p
I owe a friend £3.50. If I buy these trainers, will I still be able to pay them back?
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![Page 19: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/19.jpg)
I’ll give you a tip: It’s best to work with the numbers in one unit. I suggest changing all the
amounts to pence before calculating. What will be the subtraction calculation you will be
solving this time?
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45p
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![Page 20: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/20.jpg)
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Partition the numbers and cross out the tens and ones you’re taking away. Will you need to exchange for this
calculation?
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![Page 21: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/21.jpg)
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If I bought the trainers I wouldn’t have enough to pay back £3.50 to my
friend. I need to save some more before I buy them.
10 1 1
1 1
110
10
10 110 10
100
10
10
10 1
1 1
1
100
100 ✘✘ ✘✘✘
✘ ✘✘✘
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![Page 22: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/22.jpg)
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Plenary
Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother
Harry 28p. How much money does each person have in the end?
Jenny:
Tom:
Harry:
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![Page 23: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/23.jpg)
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Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother
Harry 28p. How much money does each person have in the end?
Jenny:
Tom: 11p
Harry: 28p
87 - 76 =
10 110
10 10
10 10
10
10 1
1
1
1
1
1✘✘✘✘✘✘
✘✘✘✘
✘✘✘
Jenny gave Tom 11p.
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![Page 24: Lets Subtract Big Numbers Slide5 › wp-content › ... · Back Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother Harry 28p.](https://reader033.fdocuments.net/reader033/viewer/2022060322/5f0d96077e708231d43b16bc/html5/thumbnails/24.jpg)
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Plenary Jenny has 87p. She gives her brother Tom some money and has 76p left. She then gives her brother
Harry 28p. How much money does each person have in the end?
Jenny: 48p
Tom: 11p
Harry: 28p
76 - 28 =
10 110
10 10
10 10
10
1
1
1
1
1✘
Jenny had 48p left.
1 1
1 1
1 1
1 1
1 1
✘✘✘✘✘✘✘✘✘
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