Mathematics
Grade-4-
Easy

Question

Use rounding to estimate:
75 x 81

  1. 80 x 80 = 6400 
  2. 70 x 80 = 5600
  3. 50 x 80 = 4000
  4. 10 x 70 = 700

Hint:

Rounding off the numbers and multiplying them

The correct answer is: 80 x 80 = 6400


    75 x 81
    75 is rounding to 80
    81 is rounding to 80
    80 x 80 = 6400.

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