Year 4

Deriving addition and subtraction facts

Year 4

Deriving addition and subtraction facts

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Lesson details

Key learning points

  1. In this lesson, we will derive addition and subtraction facts by using part whole models to show how related facts can be derived from scaling up by 10, 100 or 1000.

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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
Correct answer: 30 + 30 = 60
40 + 60 = 100
Q2.
If I know 3 + 5 = 8, then I know...
300 + 400 = 700
Correct answer: 300 + 500 = 800
600 + 200 = 800
Q3.
What's the missing part in the following equation: 220 + ___ = 550
110
Correct answer: 330
440
Q4.
What's the missing part in the following equation: 110 + ___ = 660
440
530
Correct answer: 550
Q5.
Here are three derived facts, based on the fact 3 + 5 = 8. Which is incorrect?
Correct answer: 13 + 15 = 18
30 + 50 = 80
3000 + 5000 = 8000