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Fun With Four Four's

Activities

Using four 4's and the number operations, think of the ways to get the numbers 1, 2, 3, 4, 6, 7, 8, 9, 10.

Solution

1 = 44/44; or (4 + 4) / (4 + 4) or (4 x 4) / (4 x 4) etc.;

2 = 4/4 + 4/4, or 4 x 4 / (4 + 4) ;

3 = (4 + 4 + 4) / 4 or [(4 x 4) -4] / 4;

4 = 4 + 4 x (4 -4);

5 = [(4 x 4) + 4] / 4

6 = (4 + 4) / 4 + 4;

7 = 4 + 4 -4/4, or 44/4 -4;

8 = 4 + 4 + 4 -4, or 4 x 4 -4 -4;

9 = 4 + 4 + 4/4;

10 = (44 -4) / 4

***
Source: Numeracy Counts !, Anita Rampal, R Ramanujam and L S Saraswati, N L R C, LBS National Academy of Administration, Mussoorie.

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