Mathematics
Grade-1
Easy

Question

Find the missing number in the equation 90 – ? =  20

  1. 90
  2. 80
  3. 70
  4. 60

The correct answer is: 70


    To find the missing number, count back from 90 till we get 20.
    90, 80, 70, 60, 50, 40, 30, 20
    We counted back 7 tens which is 70.
    So, the missing number is 70.

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