Estimate length in cm | Maths | Quizalize & Oak National Academy

Starter quiz

What is the length of this pencil? ______ cm.

'13' ✓
What is the height of this plant? ______ cm.

'11' ✓
What number is missing from this number line?

'14' ✓
Estimate which number the arrow is pointing to.

6 ✓

7

8
Estimate which number the arrow is pointing to.

12 ✓

14

16
Jun has made 13 using 10 and a bit. What is the missing number in this picture?

'3' ✓

Exit quiz

Which object measures about 1 cm?

An eraser

A glue stick

A paperclip ✓
Which object measures about 10 cm?

A lollipop stick ✓

A button

A ladybird
Which is the best estimate for the length of this playdough shape?

4 cm

5 cm

6 cm ✓
Which example has used '5 and a bit' correctly to estimate the length of this playdough snake?

I estimate that this snake is about 7 cm long because 5 and 2 is equal to 7

I estimate that this snake is about 9 cm long because 5 and 4 is equal to 9 ✓
I think that a good estimate for the length of this block is ______ cm.

'7' ✓
I think that a good estimate for the length of this leaf is ______ cm.

'8' ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

Length can be estimated in the same way you estimate a position on a number line.
The width of your fingernail is about 1 cm in length.
The distance from the end of your thumb to the side of your hand is about 10 cm in length.

Common misconception

Children may think that they need to get a ruler and measure length before they can estimate it.

Reinforce the language of 'about' to show that estimates do not need to be exact. Use known lengths to support estimating within 10cm, for example, practical objects such as paperclips or buttons which are about 1cm in length.

Keywords

Estimate - To find a value that is close enough to the right answer, usually with some careful thought involved.
About - Something may not be an exact measurement, but it is close to it.