Solve problems by measuring different lengths in cm using a ruler | Maths

Starter quiz

Complete the sentence. The pen is _________ than the pencil.

shorter

longer ✓
How long is the pen?

0 cm

4 cm

7 cm ✓

15 cm
The car is 10 cm long. True or False?

True
False ✓
Complete the sentence. The tower of bricks is ______ cm tall.

'12' ✓
What mistake has Jun made?

He has the ruler upside down.

He did not start the pencil at 0 cm. ✓

He needed to use a longer ruler.
Jun thinks that both the robots are the same height. Is he correct?

Yes they are the same height.

No they are not the same height. One is shorter than the other. ✓

Jacob’s pencil case is 18 cm long. Which of these items will fit in Jacob’s pencil case?

a ✓

b ✓

c
Which picture matches the story? First, the plant was 10 cm tall. Then, it grew 2 cm taller. Now, the plant is 12 cm tall.

a

b ✓
Order the steps of the story so that they match the picture.

1

⇔

First, the plant was 7 cm tall.

2

⇔

Then, it grew 2 cm taller.

3

⇔

Now, the plant is 9 cm tall.
What is the final part of the story? First my plant was 10 cm tall. Then it grew 2 cm taller.

Now, the plant is 11 cm tall.

Now, the plant is 12 cm tall. ✓

Now, the plant is 13 cm tall.
What number is missing from the story? Use the picture to help. First, I made a bracelet that was 10 cm long. Then I added a ___ cm bead. Now my bracelet is 13 cm long.

1

2

3 ✓

4
Complete the ‘First, then, now’ story using the picture. First the bracelet was 7 cm long. Then I added a 4 cm bead. Now the bracelet is ___ cm long.

5

7 ✓

11

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When using a ruler always measure starting from zero cm.
Measuring length can help you find out if something will fit inside a container or not.
You can tell 'first, then, now' stories that involve length.

Children may find it difficult to identify the 'then' part of the story because it is not found by measuring the length of the object.

Encourage children to make jumps with their finger on the ruler to demonstrate how many cm are between the 'first' length and the 'now' length.

Longer than - An object has more length than another.
Shorter than - An object has less length than another.
First - The 'first' part of a 'first, then, now' story represents an amount that was already there.
Then - The 'then' part of a 'first, then, now' story represents an amount that was added or subtracted.
Now - The 'now' part of a 'first, then, now' story represents the amount that there is at the end of the story.