Problem Solving with Time

Skip counting and number lines

The objective for today is to:• I can tell what time it is and how much time has passed by using a number line

or by skip counting.

Vocab Kickboxing!

Skip counting = counting ahead or backwards by the same number2 Special Rules: ou & ing

Other consonants: 6Other vowels: 1

Number line = line with even distance between each data point2 Special Rules: er & silent e

Other consonants: 5Other vowels:2

Review skip counting• Skip count by 5!

0, 5, 10, 15….

• Skip count by 10!0, 10, 20, 30…

• Skip count by 15!0, 15, 30…

• How does skip counting by 5, 10, or 15 make it easier for us to tell time?

Practice with skip counting!

Hour hand is on the 3, minute hand is on the 1.

• Write your answer on your paper.

Hour hand is on the 2, minute hand is on the 7.

• Write your answer on your paper.

Hour hand is on the 3, minute hand is on the 1.

• Write your answer on your paper.

Practice with benchmark times!

Hour hand is on the 6, minute hand is on the 3.

• Write your answer on your paper.

Hour hand is on the 9, minute hand is on the 12.

• Write your answer on your paper.

Hour hand is on the 1, minute hand is on the 9.

• Write your answer on your paper.

Practice with benchmark times!

Hour hand is on the 1, minute hand is on the 12.

• Write your answer on your paper.

Hour hand is on the 9, minute hand is on the 9.

• Write your answer on your paper.

Hour hand is on the 4, minute hand is on the 6.

• Write your answer on your paper.

Practice with benchmark times!

Hour hand is on the 6, minute hand is on the 6.

• Write your answer on your paper.

Hour hand is on the 3, minute hand is on the 3.

• Write your answer on your paper.

Hour hand is on the 12, minute hand is on the 3.

• Write your answer on your paper.

Practice with a word problem!• Christine has 12 math problems for

homework. It takes her 5 minutes to complete each problem. How many minutes does it take Christine to finish all 12 problems?

• Hint: Use a multiplication strategy!

5 5 5 5 5 5 5 5 5 5 5 5

12 x 5 = 60It takes Christine 60 minutes to finish all 12 problems.

Practice with a word problem!• Use your ruler to draw a 12 cm

number line.

• How many 5 minute intervals will the number line need to represent a total of 60 minutes?

• How can we make sure our intervals are evenly spaced?

• Draw your number line!

Practice with a word problem!• How many minutes are labeled on our number line?

• We start math at 10:00 and end at 11:00 today. Where would I put the 10 and 11 o’clock on our number line?

• If we start centers at 10:25, where would that be on our number line?

• If the first rotation only lasts 15 minutes, where would that be on our number line? What time would that represent?

• How many more centers could we do before math time is over?

10:00 11:0010:25

510 15

10:40

510 15

5 10 15 20 25

Your turn!• Practice page 2.A.21-22 • Exit ticket