Deriving addition and subtraction facts by using given calculations
Deriving addition and subtraction facts by using given calculations
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Lesson details
Key learning points
- In this lesson, we will derive addition and subtraction facts by using given calculations, consider how the whole or parts have changed and the impact this has on the new calculation.
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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.
If I know 3 + 3 = 6, then I know...
30 + 10 = 40
40 + 60 = 100
Q2.
If I know 3 + 5 = 8, then I know...
300 + 400 = 700
600 + 200 = 800
Q3.
What's the missing part in the following equation: 220 + ___ = 550
110
440
Q4.
What's the missing part in the following equation: 110 + ___ = 660
440
530
Q5.
Here are three derived facts, based on the fact 3 + 5 = 8. Which is incorrect?
30 + 50 = 80
3000 + 5000 = 8000
5 Questions
Q1.
What's the same? What's different? 364 + 302 = 666 and 374 + 302 = 676
1 part has decreased by 10
1 part has increased by 100
Q2.
What's the same? What's different? 764 - 204 = 560 and 754 - 204 = 550
1 part has decreased by 100
1 part has increased by 10
Q3.
What's the same? What's different? 3672 + 1474 = 5146 and 3972 + 1474 = 5446
1 part has decreased by 300
1 part has increased by 30
Q4.
If... 362 + 205 = 567 then... 262 + 205 = ?
667
67
Q5.
If... 751 - 303 = 448 then... 741 - 303 = ?
458
48