Year 4
Deriving addition and subtraction facts by using given calculations
Year 4
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.
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.
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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