Repeated addition

Mutiplication of a number with other number can be done in the following ways.

(i) Dot multiplication

(ii) Repeated addition

(iii) Regrouping

(iv) Standard multiplication algorithm

(v) Lattice multiplication

Repeated addition:

Let us recall the repeated addition we have learnt in lower classes.

i) Find the total number of flowers.

We can find the total number of flowers as follows.

 3 + 3 + 3 = 9

3 groups of 3 flowers make 9

3 × 3 = 9

ii) Find the total number of leaves.

4 + 4 + 4 + 4 = 16

4 × 4 = 16

iii) How many apples are there in four plates

There are four plates. Each has five apples.

Total number of apples = 5 + 5 + 5 + 5 = 20

5 × 4 = 20