DECIMALS - Windsor C-1 School District
DECIMALS
add or subtract
line the decimal points up. Then add or subtract
EXAMPLE: 3.4 + 3.55
would line up like this 3.4
+ 3.55
NOT 3.4
+ 3.55
DECIMALS
multiply
1st: forget about the decimal points and just multiply like usual
2nd: count the number of spaces that are behind the decimal points in the problem
3rd: put the sum of the spaces in your answer
EXAMPLE: 1.3
x .2 3 do not line up the decimals
3 9
+ 2 6
.2 9 9
1.3 has one place behind the decimal point and
.23 has two places behind the decimal point
1 place + 2 places = 3 places behind the decimal point you must have in your answer.
EXAMPLE: 1 .42
x .92
2 8 4
+1 2 7 8
1 2 9 6 4 = 1. 2 9 6 4
there are four spaces behind the decimal points so I need four spaces behind the decimal point in the answer.
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