Q1 of 95 Page 83

Compute the following in head:
10.7 9.3

it can be written as (10+0.7) (10-0.7)

using identity -

(10+0.7) (10-0.7) = -

= 100 - 0.49

= 99.51

Compute the following in head:

10.7 9.3

Look at this pattern:

Explain the general principle using algebra.

Questions · 95

4. Identities

1 1 1 1 1 1 2 2 2 2 2 2 3 3 4 4 1 1 1 2 2 2 2 2 2 3 3 4 4 5 5 1 1 1 1 1 1 1 1 2 2 3 3 3 3 1 1 1 1 1 1 1 1 1 1 1 1 2 2 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 1 1 1 1 2 2 2 2 3 3 3 3 1 1 1 1 1 1 1 1

Compute the following in head:10.7 9.3