Math 6 Unit 02 Notes - Decimals Worksheet Page 12
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19Math 6 Unit 02 Notes – Decimals
But once again, students must eventually move on to a procedural method for subtraction decimals.
−
Example:
9.86 4.823
Rewrite vertically lining up the
9.86
decimal points.
−
4.823
Fill in zeros where necessary so that
both numbers have the same decimal
place value.
9.86
0
−
4.823
Subtract.
5
.037
Multiplying Decimals
One method students might have seen from previous grades was the use of base ten blocks – or
rectangular arrays. A review of this strategy may help students move into decimal multiplication.
( )( )
1.2 2.3 =
Using the base ten blocks we build a rectangular array. For example,
1.2
= 2.76
2.3
Procedurally, we would use the ….
Algorithm for Multiplication of Decimals
1. Rewrite the numbers vertically.
2. Multiply normally, ignoring the decimal point
3. Count the number of digits to the right of the decimal points
4. Count that same number of places from right to left in the
product (answer)
×
Example:
1.63 4.2
Math 6 NOTES
Unit 02: Decimals
Page 12 of 19
2014-15 -NVACS
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