-
Introduction
View the activity introduction for more information on the topic
-
Read aloud
Read the question aloud
-
Accessibility
Open the accessibility toolbar to change fonts and contrast, choose a different language, use a ruler and more
In this activity, we will be multiplying numbers by 10 or 100.
To multiply a whole number by 10: move each digit one place to the left, then fill any empty places with zero.
43 × 10 = 430
654 × 10 = 6,540
70 × 10 = 700
To multiply a whole number by 100: move each digit two places to the left, then fill any empty places with zero.
43 × 100 = 4,300
60 × 100 = 6,000
542 × 100 = 54,200
Let's try some examples together.
Example 1
Multiply 65 by 10.
Answer
To multiply by 10, each digit moves one place to the left.
In 65, we have 6 tens and 5 ones.
The 6 tens become worth 6 hundreds.
The 5 ones become worth 5 tens.
We fill the ones place with zero as a placeholder.
65 × 10 = 650
Example 2
Multiply 24 by 100.
Answer
To multiply by 100, each digit moves two places to the left.
In 24, we have 2 tens and 4 ones.
The 2 tens become worth 2 thousands.
The 4 ones become worth 4 hundreds.
We fill the ones and tens places with zeros as placeholders.
24 × 100 = 2,400
Now that you know how to multiply by 10 and 100, you are ready to try the next ten questions.
Question
/ 10Mr Shepherd
Do you want to skip questions and finish?
Hold up, it looks like there may be an issue with your spelling. Why not try it again?
You need to check your answer before you proceed. Are you sure you want to skip?
Teacher explanation