Adding and subtracting using the 'round and adjust' strategy
Adding and subtracting using the 'round and adjust' strategy
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Lesson details
Key learning points
- In this lesson, we will learn how to use the 'round and adjust' strategy to solve addition and subtraction equations.
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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.
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5 Questions
Q1.
1. Use the derived fact '9-6 = 3' to solve 90 000 - 60 000 = ________.
30
300
300 000
Q2.
2. Use the make 10 strategy to solve: 160 000 + 60 000 = _________.
200 0000
22 000
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
80 365
Q5.
Which derived fact could help us solve: 14 000 - 9000?
14 + 9 = 23
23 - 9 = 14
5 + 9 = 14
5 Questions
Q1.
What is the 'round and adjust' strategy?
The strategy involves rounding numbers to get an approximate answer.
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
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
Q5.
5. Use 'rounding and adjusting' to solve: 215 678 + 3800 =
217 478
218 478
220 478