Fact families – addition and subtraction

Yesterday we found that the four number operations  ( +;; x ; ÷) were related to each other in different ways.

+ and x                               – and ÷

+ and –                                x and ÷

We looked at addition and subtraction fact families: –

2,3,5

  • 2 + 3 = 5
  • 3 + 2 = 5
  • 5 – 3 = 2
  • 5 – 2 = 3

red_and_whitered_and_white

 

Now try these in your math journal.

Make addition and subtraction fact families from these numbers: –

1. 3, 2, 1

2. 4, 8, 12

3. 15, 27, 12

4. 37, 14, 23

5. 112, 44, 68

6. 12, 24, 12

Now make up 3 fact family questions yourself and provide the answers.

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