Decimal Form Of Rational Numbers Worksheet - Chapter 2.2, Mathlink 9, Mcgraw-Hill Ryerson School Page 3
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8Show You Know
Estimate and calculate.
-4.38 + 1.52
a)
-1.25 - 3.55
b)
Example 2:
Multiply and Divide Rational Numbers in
Decimal Form
Estimate and calculate.
0.45 × (-1.2)
a)
-2.3 ÷ (-0.25)
b)
Solution
Estimate.
a)
0.5 × (-1) = -0.5
Calculate.
Method 1: Use Paper and Pencil
You can calculate by multiplying the decimal numbers.
0.45 × 1.2 = 0.54
Determine the sign of the product.
How do you know
0.45 × (-1.2) = -0.54
what the sign of the
product is?
Method 2: Use a Calculator
C 0.45 × 1.2 + -
= –0.54
Estimate.
b)
-2.3 ÷ (-0.25)
≈ -2 ÷ (-0.2)
≈ 10
Calculate.
C 2.3 + -
÷ 0.25 + -
= 9.2
Literacy Link
Parentheses is another
Show You Know
name for brackets. They
can be used in place of
Estimate and calculate.
a multiplication sign.
-1.4(-2.6)
a)
For example,
-2.76 ÷ 4.6
b)
-4 × 1.5 = -4(1.5)
2.2 Problem Solving With Rational Numbers in Decimal Form • MHR
57
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