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Year 1

Solve subtraction problems using knowledge of 10 and a bit

I can solve subtraction problems using knowledge of 10 and a bit in different contexts.

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Share activities with pupils
New
New
Year 1

Solve subtraction problems using knowledge of 10 and a bit

I can solve subtraction problems using knowledge of 10 and a bit in different contexts.

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. The teens numbers can be represented as ten and a bit.
  2. We can solve addition and subtraction problems with the ones part or tens part missing.
  3. A part-part whole model can help to represent the missing whole or missing parts.

Common misconception

Pupils do not connect a known partition of a teen number e.g. 16 is 1 ten and 6 ones to a subtraction or addition context and therefore use a less efficient strategy.

Practical experiences using a group of 10 and ones are key to supporting understanding that the partitioning structure can work for different contexts.

Keywords

  • Partition - The act of splitting an object or value down into smaller parts.

  • Whole - All of a group or number.

  • Part - A piece or section of the whole.

This lesson includes a range of contexts that cover different addition and subtraction structures to familiarise pupils with problem structures. Contexts can be adapted to suit needs of pupils but ensure these continue to include a breadth of structures.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Video

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Starter quiz

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6 Questions

Q1.
What is the missing whole?
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Correct Answer: 19
Q2.
What is the missing part?
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Correct Answer: 10
Q3.
Which equation matches the part-part-whole model?
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Correct answer: 10 + 3 = 13
10 + 13 = 3
10 = 13 + 3
Correct answer: 3 + 10 = 13
Q4.
Jacob is going to hop 9 times. He has already hopped 5 times. How many more hops does he need to do?
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Correct Answer: 4, 4 hops
Q5.
Izzy is going to jump 10 times across the playground. She has jumped 6 times. How many more jumps does she need to do?
Correct Answer: 4, 4 jumps
Q6.
What is the missing part in the part-part-whole model?
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Correct Answer: 2

Exit quiz

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6 Questions

Q1.
Jacob and Laura have collected 13 sticks at the park. Laura has 3 sticks. Jacob has dropped his sticks. How many did he drop?
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Correct Answer: 10
Q2.
Which part-part-whole model matches this problem? Jacob collected some stones. He collected 15 stones but lost 5 of them. How many did he have left?
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Correct Answer: An image in a quiz
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An image in a quiz
Q3.
Which of these equations can be represented by this bar model?
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10 + 14 = ___
Correct answer: 14 − 10 = ___
10 − 14 = ___
Q4.
Jacob and Laura collected 19 stones. 10 are brown and the rest are grey. How many are grey? Which equation matches this problem?
19 + 10 = ___
Correct answer: 19 − 10 = ___
10 − 19 = ___
Q5.
Jacob had some cubes. Laura took 8 and he has 10 left. How many cubes did he have at the start? Which equation with a missing number correctly matches this problem?
Correct answer: ___ − 8 = 10
10 − 2 = ___
10 − ___ = 8
Q6.
Laura has red, blue and yellow marbles. There are 17 marbles in total. 3 marbles are red and 7 marbles are blue. How many are yellow?
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Correct Answer: 7