Q2 of 95 Page 83

Look at this pattern:

Explain the general principle using algebra.

we can write it as _-

Using identity = + - 2

and = + + 2

= 1+_{+ 1 -( 1+}_-1)

_{= 1 +} _{+1 - 1 -} ₊₁

_{= 2}

Similarly it can be done for other numbers.

Compute the following in head:

10.7 9.3

Compute the following in head:

10.7 9.3

Look at this pattern:

Explain the general principle using algebra.

Find out the larger product of each pair below, without actual multiplication.

25 × 75, 26 × 74

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

Look at this pattern:Explain the general principle using algebra.