S1 (1.1) Decimals.notebook - Weebly

S1 (1.1) Decimals.notebook November 29, 2017

Daily Practice 9.10.2017

Q1. Round 88.94 to the nearest unit

Q2. 4 x 7

Q3. 5 (6)

Q4. 20 x 40

Q5. 29.88 + 36.9

Today we will be revising over how to add and subtract decimals.

Adding and subtracting decimals

Always ensure each digit has its correct place value and the number that has the greater value is on top when subtracting.

Examples:

(a) 22.4 + 3.677 (b) 30 - 5.89 (c) 28.1143 - 1.07 + 0.3

Adding and subtracting decimals Adding and subtracting decimals



20 questions mental maths

Today we will be practising adding and subtracting decimals.


Q1. Find 25% of 70


Q3. Find 4/7 of 2849

Q4. -9 x 6

Q5. (3 x 2) ÷ -2

Today we will be learning how to multiply decimals.

Recap. of multiplying by 10, 100, 1000

2.3 x 10


Always ensure you have the same amount of digits after the decimal point in your answer as there are in the question

Examples:

(a) 23.45 x 3

(b) 9.645 x 40

Multiplying Decimals Questions:

(a) 45.62 x 5

(b) 812.3 x 4

(c) 2.341 x 3

(d) 9.81 x 7

(e) 111.8 x 30

(f) 821.16 x 200

(g) 45.678 x 90

(h) 1.112 x 500

(i) 3.044 x 6000

(j) 31992.7 x 80

Daily Practice 24.10.2017Q1. 4522 x 90


Q3. If 2 x k ‐ 1 = 17, what is k?

Q4. ‐36 ÷ ‐6

Q5. Calculate the perimeter

5.5cm

Today we will be learning how to multiply decimals by decimals.

Multiply like normal and ignore the decimal point. Then ensure that however many digits are after the decimal point in the question, it has to be the same in the answer.

Examples:

(a) 0.4 x 0.2

(b) 0.6 x 0.08

Multiplying decimals by decimals

(c) 0.026 x 0.7


Today we will be learning how to multiply trickier decimals and divide with decimals.


Q1.

Find 50% of 26Q2. 32.77 + 1.018

Q4. Write down a prime number between 40 and 50

Q3. 3 x (-4) x (-5)

Q5) 0.2 x 0.03

Today we will be learning to divide with decimals.

Do a step sum and always ensure your decimal point is lined up.

Examples:

(a) 342 ÷5 (b)43.47÷ 9 (c) 0.1824 ÷ 6

Dividing with Decimals

Division QuestionsQ1) 441 ÷ 2

Q2) 3.305 ÷ 5

Q3) 2.97 ÷ 3

Q4) 4018 ÷ 4

Q5) 3031 ÷ 2

Q6) 673.2 ÷ 9

Q7) 10.2 ÷ 6

Q8) 101.5 ÷ 7

Q9) 361.6 ÷ 8

Q10) 5 ÷ 8

Q11) 8.64 ÷ 8

Q12) 2045 ÷ 4

Q13) 250.56 ÷ 2

Q14) 3.75 ÷ 4

Q15) 5.49 ÷ 90

Division QuestionsQ1) 441 ÷ 2

Q2) 3.305 ÷ 5

Q3) 2.97 ÷ 3

Q4) 40.18 ÷ 5

Q5) 303.2 ÷ 2

Q6) 673.2 ÷ 9

Q7) 10.2 ÷ 6

Q8) 101.5 ÷ 7

Q9) 361.6 ÷ 8

Q10) 54.96 ÷ 8

Q11) 8.64 ÷ 8

Q12) 20.45 ÷ 4

Q13) 250.56 ÷ 2

Q14) 1.0812 ÷ 4

Q15) 5.49 ÷ 90


Magic Squares

2

7

What is the magic number?

1

3

4

6 2.4

1.8

4.8

3


Q1. 4 x 5 ‐ 2 + 3

Q2. Find 3/7 of 2149

Q3. 17.24 + 1.005

Q4. 0.008 x 0.9

Q5. ‐5 + (‐15)

Today we will be learning to divide decimals by decimals.

To divide a decimal by a decimal, make the denominator a whole number first (by multiplying top and bottom by 10,100 or 1000).

Examples:

(a) 24 ÷ 0.08 (b) 0.18 ÷ 0.9 (c) 0.48 ÷ 0.006

Decimals dividing by decimals


Trickier decimal division

http://www.mathworksheets4kids.com


(a) 0.428 ÷ 0.002 (e) 0.036 ÷ 0.0004

(b) 0.12 ÷ 0.003 (f) 0.2466 ÷ 0.06

(c) 0.065 ÷ 0.5 (g) 0.459 ÷ 0.0009

(d) 0.3224 ÷ 0.8 (h) 0.0497 ÷ 0.07


Q1. There were 3788 witches surrounding a giant

cauldron, round to the nearest hundred

Q2. Annie ate 25% of 3000 brains, how many is this?

Q3. 6 - 3 x 5

Q4. 21.45 x 60 Q5. 0.16 ÷ 0.02

Today we will be dividing decimals by decimals and reading decimal scales.


(i) 0.428 ÷ 0.002 (j) 0.036 ÷ 0.0004

(k) 0.12 ÷ 0.003 (l) 0.2466 ÷ 0.06

(m) 0.065 ÷ 0.5 (n) 0.459 ÷ 0.0009

(o) 0.3224 ÷ 0.8 (p) 0.0497 ÷ 0.07

Decimal Scales

1 2


Decimal Scales

22 22.1

Decimal Scales

0 1

Decimal Scales

19 20

1 2 3

12 13

1.5 2

2.5 2.6

0 0.5

(a) (b)

(c) (d)

Rounding Decimals

Rounding a number to the nearest unit (nearest whole number).

H T U . t h th

Examples: Round to the nearest unit

(a) 3.4

(b) 75.182


Round each of these to the nearest unit

(i) 2.6 (ii) 3.22 (iii) 7.95 (iv) 14.715

(v) 18.225 (vi) 157.63 (vii) 44.8177

Daily Practice 2.11.2017Q1. Write two hundred thousand and eighty three in digits

Q2. 6 ‐ 5 x 4

Q3. ‐4 x (‐8)

Q4. 6 ‐ (‐1)

Q5) 0.56 ÷ 0.007

Today we will be continuing to learn to round to decimal places.

Homework due Monday.

Rounding to 1 decimal place

Rounding a number to 1 d.p. means to leave 1 digit after the decimal point.

Examples: Round these to 1 decimal place

(a) 3.24

(b) 1.855

(c) 2411.299

(d) 101.99

Rounding Decimals

Round each of the following to the 1 decimal place

(a) 22.91

(b) 43.24

(c) 2.87

(d) 19.9132

(e) 20.473

(f) 38.129

(g) 43.456

(h) 9.921

(i) 2035.10987 (j) 2.44138 (k) 10.8991

Rounding Decimals

Round each of the following to the 1 decimal place

(a) 22.91

(b) 43.24

(c) 2.87

(d) 19.9132

(e) 20.473

(f) 38.129

(g) 43.456

(h) 9.921

(i) 2035.10987 (j) 2.44138 (k) 10.8991


Round these to 2 decimal places

(c) 41.256 (d) 38.1622

2 decimal places means to leave 2 digits after the decimal point

Today we will be rounding to decimal places using wipe boards.

S1 (1.1) Decimals.notebook - Weebly

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