Arithmetic - Decimals Flashcards Preview

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Flashcards in Arithmetic - Decimals Deck (4)
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1

decimals

a collection of digits after a period is called a decimal fraction

Example: 0.609 = 609/10x10x10 = 609/1000

2

adding decimals

Line the decimals up:
1.452
+1.3

"Pad" with zeros:
1.452
+1.300

Add:
1.452
+1.300
2.752

3

subtracting decimals

Line the decimals up:
7.368
-1.15

"Pad" with zeros:
7.368
-1.150

Subtract:
7.368
-1.150
6.218

4

multiplying decimals

Multiply normally, ignoring the decimal points.
Then put the decimal point in the answer - it will have as many decimal places as the two original numbers combined.

0.03 × 1.1
multiply without decimal points:
3 × 11 = 33
add the three decimal places back in
0.033