Year 5

Year 5

# Adding and subtracting using the 'round and adjust' strategy

## Lesson details

### Key learning points

1. In this lesson, we will learn how to use the 'round and adjust' strategy to solve addition and subtraction equations.

### 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. Use the derived fact '9-6 = 3' to solve 90 000 - 60 000 = ________.
30
Correct answer: 30 000
300
300 000
Q2.
2. Use the make 10 strategy to solve: 160 000 + 60 000 = _________.
200 0000
22 000
Correct answer: 220 000
2200
Q3.
3. Use either the derived facts or make 10 strategy to solve: 18 000 - 15 000 =
30 000
300
300 000
Q4.
150 365 people attend an event. 80 000 people leave early. How many people are left?
100 365
60 365
Correct answer: 70 365
80 365
Q5.
Which derived fact could help us solve: 14 000 - 9000?
14 + 9 = 23
Correct answer: 14 - 9 = 5
23 - 9 = 14
5 + 9 = 14

## Exit quiz

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### 5 Questions

Q1.
What is the 'round and adjust' strategy?
The strategy involves rounding numbers to get an approximate answer.
Correct answer: The strategy involves rounding part of an equation to the nearest multiple of 10, 100, 1000, 10 000 or 100 000. Then, adjust for this rounding afterwards.
The strategy involves using partitioning to add and subtract.
The strategy involves using the column method to add and subtract.
Q2.
2. Use 'rounding and adjusting' to solve: 53 700 + 3998 =
57 598
Correct answer: 57 698
57 798
57 898
Q3.
3. Use 'rounding and adjusting' to solve: 6880 - 2990 =
1890
4890
5890
Q4.
4. Use 'rounding and adjusting' to solve: 17 456 + 1980 =
19 136
19 236
19 336
Correct answer: 19 436
Q5.
5. Use 'rounding and adjusting' to solve: 215 678 + 3800 =
217 478
218 478
Correct answer: 219 478
220 478