Year 5

Year 5

# Using and explaining addition and subtraction strategies

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## Lesson details

### Key learning points

1. In this lesson, we will be learning how to use the most efficient addition and subtraction strategies. We will apply this knowledge to solving addition pyramids.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
1. Complete the following equation using your knowledge of number bonds: 74 + _____ = 100
13
2
36
Q2.
2. Use the partitioning strategy to solve the following equation: 34 + 13 =
36
37
46
Q3.
What is the law of commutativity?
A rule which helps us to add by using the column method at all times.
A rule which states that addition and subtraction are the opposite of each other.
Correct answer: A rule which states that you can swap the numbers in an addition/multiplication equation and your answer will remain the same.
A rule which suggests that we should always check our answers using the inverse method.
Q4.
4. Use the round and adjust strategy to solve: 71 + 16 =
78
81
86
Q5.
5. Which strategy would be most appropriate/efficient when solving: 33 + 21 =
Column method
The rule of commutativity

## Exit quiz

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### 5 Questions

Q1.
1. Use the 'round and adjust' strategy to solve: 398 + 212.
600
601
620
Q2.
2. Use the 'find the difference by adding on' strategy to complete the equation: 438 + _____ = 620.
160
180
181
Q3.
3. Use the 'partitioning for subtraction' strategy to solve: 487 - 134 =
301
328
377
Q4.
4. Use addition and subtraction to find the missing part of this equation: 124 + ______ + 330 = 754
156
200
209
Q5.
5. Use addition and subtraction to find the missing part of this equation: 389 + ______ + 421 = 924