Page 86 - Math Smart - 7

Check My
Understanding

Multiply,
a) 3.2 X 10 b) 0.9 X 10 c) 1.6 X 100 d) 2.32 X 100
e) 0.04x10 f) 0.03 X 100 g) 3.04 X 10 h) 5.09 X 100
1) 15.3 X 10 j) 2.6X1000 k) 1000 X 0.02 I) 1000 X 1.04

Fill in the blanks.
a) 2.6 X = 26 b) 4.03 X _ = 403 c) 60.2 X = 602
d) 0.32 X = 32 e) 3.02 X _ = 3020 f) 0.14 X = 140
g) X 0.26 = 26 h) X 2.09 = 20.9
O A toy costs $23.99. How much would
a) 100 of the same toys cost?
b) 1000 of the same toys cost?
O Jo drinks 1.8 i of water every day. How many litres of water will he drink in 10 days?
O Use the numbers in the box to write as many different multiplication number sentences
as you can. Each number can be used more than once.
Example: 0.3 x 10 = 3

a)
0.3 30 300 3
10 100 1000 0.6
0.6 0.1 0.003

b)
0.07 0.7 7 70 700
10 100 1000 10000

Work with a partner. Members of the owl family have different opinions about
multiplying a decimal number by 10. Analyse each owl's statement and give feedback as
to why you think each statement is correct or incorrect.

When you multiply
answer
by 10, you add a zero. What do you
0.8 X 10 = 0.80 think?

0.8 X 10

You need to move each
You need to move each
digit two places to the left. digit one place to the left
0.8 X 10 = 80 0.8 X 10 = 8.0

Decima s