# Posts Tagged ‘Problems Based On Multiplication’

# Problems Based On Multiplication

### Wednesday, November 4th, 2009

**TYPE 1: Multiplying by 12 **

Consider

**Example 1** :12 X 7

Step 1: Multiply the 1 of the 12 by the

number we are multiplying by, in this case 7. So 1 X 7 = 7.

Step 2: Multiply this 7 by 10 giving 70.

Step 3: Now multiply the 7 by the 2 of twelve giving 14. Add this to 70 giving 84.

Therefore 7 X 12 = 84

**Example 2**: 17 X 12

Step 1: Multiply the 1 of the 12 by the

number we are multiplying by, in this case 17. So 1 X 7 =1 7.

Step 2: Multiply this 17 by 10 giving 170.

Step 3: Now multiply the 17 by the 2 of twelve giving 34. Add this to 170 giving 204.

Therefore 17 X 12 = 204

TYPE 2: Using VERTICALLY AND CROSSWISE you do not need to the multiplication tables beyond 5 X 5.

**Example 1**: Suppose for 8** **x 7

8 is 2 below 10 and

7 is 3 below 10.

This can be written as

8 2

X

7 3

5 6

Step 1: You subtract crosswise 8-3 or 7 – 2 to get 5,to get the first figure of the answer.

Step 2: You multiply vertically: 2 x 3 to get 6, the last figure of the answer.

Step 3: Thus, the answer is 56.

**Example 2**: Suppose for 7** **x 6

7 is 3 below 10 and

6 is 4 below 10.

This can be written as

7 3

X

6 4

3 _{1}2

Step 1: You subtract crosswise 6-3 or 7 – 4 to get 3,to get the first figure of the answer.

Step 2: You multiply vertically: 4 x 3 to get 12, the last figure of the answer. There is a carry: the 1 in the 12 goes over to make 3 into 4.

Step 3: Thus, the answer is 42.

Tags: Multiplication - word problems, Problems Based On Multiplication

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