Download Multiplying by 10, 100, and 1,000

Or… How to impress your friends and
relatives with your amazing
mathematical brain!
When multiplying a number by
ten,
multiply the number by one and
add a zero in the ones place.
Example:
10 x 2 = _____
1 x 2 = 2,
add one zero,
10 x 2 = 20
More examples:
10 x 34 = _____
1 x 34 = 34,
add one zero, 10 x 34 = 340
567 x 10 = ______
567 x 1 = 567,
add one zero, 567 x 10 = 5,670
When multiplying a number by 100,
multiply the number by one and
add a zero in the tens and ones place
(two zeros).
Example:
100 x 4 = _____
1 x 4 = 4,
add two zeros,
100 x 4 = 400
More examples:
29 x 100 = ____
29 x 1 = 29,
add two zeros,
29 x 100 = 2,900
963 x 100 = _____
963 x 1 = 963,
add two zeros,
963 x 100 = 96,300
Math is so cool!
When multiplying a number by 1,000,
multiply the number by one and
add a zero in the hundreds, tens and
ones place (three zeros).
Example:
7 x 1,000 = ______
7 x 1 = 7,
add three zeros, 7 x 1,000 = 7,000
Awesome!
More examples:
1,000 x 27 = _____
1 x 27 = 27,
add three zeros,
1,000 x 27 = 27,000
342 x 1,000 = _____
342 x 1 = 342,
add three zeros,
342 x 1,000 = 342,000
Want to go to the next level?
Here’s the rule:
Anytime you multiply two numbers with
zeros on the right side such as 20 x 140,
after multiplying the two numbers (2 x 14)
your answer will have the same number
of zeros added onto the right side.
So….
20 x 140 = ____
2 x 14 = 28,
20 x 140 = 2,800
Amazing!
120 x 8,000 = ______
12 x 8 = 96
120 x 8,000 = 960,000
Such a huge number!
Aren’t we clever!
900 x 50 = _____
9 x 5 = 45
900 x 50 = 45,000
Wow we’re smart!