Page 105 - Math Genius C2

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MULTIPLYING A 2-DIGIT NUMBER BY A 1-DIGIT NUMBER

Multiplication without Regrouping

example: Multiply 23 by 3.

Solution:

Step 1. Arrange the given Step 2. Multiply the ones. Step 3. Multiply the tens.

numbers in columns 3 × 3 = 9 ones 2 × 3 = 6 tens
correctly.
t O t O
t O 2 3 2 3
2 3 × 3 × 3
× 3 9 6 9

Thus, 23 × 3 = 69.

Let us look at some more examples:

(a) t O t O (b) t O t O

1 4 1 4 2 2 2 2
× 2 × 2 × 4 × 4

8 2 8 8 8 8

Practice Time 5E

Multiply the following. One has been done for you.

1. t O 2. t O 3. t O 4. t O

1 2 3 2 2 2 3 3
× 4 × 2 × 3 × 2

4 8

5. t O 6. t O 7. t O 8. t O

2 1 4 0 3 3 1 1
× 4 × 2 × 3 × 6

Mathematics-2 103