Page 107 - Math Genius C2

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Step 1. Multiply the ones and regroup. Step 2. Multiply the tens and add the

7 × 5 = 35 ones H t O carried over. H t O

= 3 tens + 5 ones 3 6 × 5 = 30 tens 3 3

Write 5 in the ones column 6 7 30 tens + 3 tens = 33 tens 6 7
× 5 × 5
and carry over 3 to the = 3 hundreds + 3 tens
5 3 3 5
tens column. Write 3 in the tens column

and 3 in the hundreds column.
Thus, 67 × 5 = 335.

Think Tank Critical Thinking
Fill in the blanks.
1. T O 2. T O 3. H T O
8 5

× 6 × 5 × 5
3 6 9 7 5

Practice Time 5F

1. Multiply the following by regrouping ones.

(a) t O (b) t O (c) t O (d) t O

2 4 1 5 1 9 2 6
× 3 × 5 × 5 × 2

2. Multiply the following by regrouping tens.

(a) H t O (b) H t O (c) H t O (d) H t O

6 3 8 2 9 1 7 0
× 3 × 4 × 8 × 7

Mathematics-2 105