Question

2. Find the squares of the following, using diagonal method
(1) 64
() 87
(iii) 52​

Answer 1

Explanation:

1. 8
2. 9.32
3. 7.21

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Answer 2

1) 64² = (60+4) ² = 3600+16 +2× 60×4 = 3616+480= 4096

2)87² = (80+7)²= 6400+49×2×80×7= 6400+49+1120= 7569

3) 52²= (50+2)²= 2500+4+2×50×2= 2704