Use knowledge of 10 and a bit to solve problems | Maths

Starter quiz

How many straws are shown here?

'15' ✓
How many pencils are shown here?

'11' ✓
Which place value chart represents the ten frames?
Look at the image. Which addition does it represent?

17 = 10 + 7 ✓

7 + 10 = 17 ✓

17 + 10 = 7
Match the word to the correct numeral.

fourteen

⇔

14 ✓

sixteen

⇔

16 ✓

nineeen

⇔

19 ✓
Match the teen number to the number of tens and ones.

14 is one ten and

⇔

4 ones ✓

16 is one ten and

⇔

6 ones ✓

17 is one ten and

⇔

7 ones ✓

Exit quiz

How many pencils are shown here?

'14' ✓
What do we call the total when two parts are added to make the whole?

add

part

sum ✓
Which equation matches the part-part-whole model?

10 + 2 = 12

10 + 7 = 17 ✓

10 + 5 = 15
Which part part whole model matches this equation? 10 + 5 = 15
What is the missing whole in this image?

'15' ✓
What is the missing part in this image?

'6' ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

The teens numbers can be partitioned into ten and a bit.
Problems can be represented using part-part-whole models, tens frames and sum equations.
The 10 and a bit can be represented in the problem.

Common misconception

Pupils continue to count all when finding the sum instead of counting on from 10 or using their developing fluency with partitioning teen numbers into 10 and a bit.

Provide concrete and pictorial examples where 10 is provided as a group that is hard to separate and count. Continue to emphasise one ten as a group of 10 that does not need to be counted in ones.

Keywords

Partition - The act of splitting an object or value down into smaller parts.
Part - A piece or section of the whole.
Sum - The total when numbers are added together.