Page 51 - Fun with Mathematics 2

MULTIPLYING A 4-DIGIT NUMBER BY A 1-DIGIT NUMBER

4
Multiply 2356 by .
4
4
4
Step 1. Multiply the ones digits. 6 × = 2 = 2 tens + ones
Th H T O Write under the ones (O) column and carry over
4
2
2
1
2 3 5 6 2 tens to the tens (T) column.
4
× 4 Step 2. Multiply the tens digits. 5 × = 20
9 4 2 4 Add all the tens: 20 tens + 2 tens = 22 tens
= 2 hundreds + 2 tens

Write 2 under the tens (T) column and carry
over 2 hundreds to the hundreds (H) column.
4
Step 3. Multiply the hundreds digits. 3 × = 12
Add all the hundreds: 12 hundreds + 2 hundreds
4
4
= 1 hundreds = 1 thousand + hundreds
Write 4 under the hundreds column and carry
over 1 thousand to the thousands (Th) column.
4
4
Step . Multiply the thousands digits. 2 × = 8
Add all the thousands: 8 thousands + 1 thousand

= 9 thousands
Write 9 under the thousands (Th) column.
4 4
4
The product of 2356 and is 9 2 .

10 Solve the following.

(a) Th H T O (b) Th H T O (c) Th H T O

2 3 1 4 1 3 0 5 2 3 1 4

× 2 × 3 × 4

(d) Th H T O (e) Th H T O (f) Th H T O

1 2 6 5 1 4 3 6 1 2 7 9

× 5 × 6 × 7

51