Page 67 - Start Up Mathematics_3

H T O
1 Step 2: 10 ones = 1 ten + 0 ones
4 3 2
Keep 0 in the ones place and carry over
× 5 1 to the tens place.
1
0

H T O
1 Step 3: Multiply the digit at the tens place
4 3 2 by 5.

× 5
3 tens × 5 = 15 tens
1
6 0 Add the carried over 1.

15 tens + 1 ten = 16 tens

H T O
1 1 Step 4: Write 6 in the tens place and carry over
4 3 2 1 to the hundreds place.

× 5
1 6 0

Th H T O
2 1 1 Step 5: Multiply the digit at the hundreds place
4 3 2
by 5.
× 5
4 hundreds × 5 = 20 hundreds
2 1 6 0
Add the carried over 1.
So, 432 × 5 = 2160. 20 hundreds + 1 hundred = 21 hundreds

Write 21 hundreds as 2 thousands and
1 hundred.

Common Mistake!

A Challenge! Always remember to add the

Find the mistake in this problem. carried over digit.
4 2 2
7 8 3 6 0 5

× 8 × 4
() 6 0 6 4 2 4 0 0

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