# Working with Decimals

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## Overview

We can use what we know about standard algorithms to solve problems involving decimals.

For addition and subtraction, line up the decimals and solve
2.5 + 1.67 = ?

Multiplication Division
For multiplication, calculate the problem
as if both decimals were whole numbers.
Then, determine where to place the
decimal by looking at the place value of
the original numbers.
Solve:
For division, shift the decimals to make
the dividend a whole number. Shift the
decimal in the divisor the same number
of spaces.
Solve:
Step One Step One
Step Two
The first number had 2 digits to the
right of the decimal. The second number
had 1 digit to the right of the decimal.
So, that’s a total of 3 digits to the
right of the decimal. Place your decimal
3 units to the left.
3.288
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25.7 + 6.24 = ?

45.27 + 17.3 = ?

63.82 + 24.6 = ?

2.576 – 1.3 = ?

142.23 – 1.273 = ?

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