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Computing with Decimals
Adding and Subtracting
Decimals
Line up the decimal points.
4.6 + 7.23
Line up the decimal points.
4.6 + 7.23
4.60+ 7.23
Fill in with zeros.
4.6 + 7.23
4.60+ 7.23
Fill in with zeros.
4.6 + 7.23
4.60+ 7.23
Add or subtract normally.
4.6 + 7.23
4.60+ 7.23
Add or subtract normally.
4.6 + 7.23
4.60+ 7.2311 83
Place the decimal point under the other decimal points.
4.6 + 7.23
4.60+ 7.2311 83
Place the decimal point under the other decimal points.
4.6 + 7.23
4.60+ 7.2311.83
Line up the decimal points.
12 − 2.46
Line up the decimal points.
12 − 2.46
12 has a decimal point hidden behind it.
Line up the decimal points.
12 − 2.46
12.00− 2.46
Fill in with zeros.
12 − 2.46
12.00− 2.46
Fill in with zeros.
12 − 2.46
12.00− 2.46
Add or subtract normally.
12 − 2.46
12.00− 2.46
Add or subtract normally.
12 − 2.46
12.00− 2.46
9 54
Place the decimal point under the other decimal points.
12 − 2.46
12.00− 2.46
9 54
Place the decimal point under the other decimal points.
12 − 2.46
12.00− 2.46
9.54
Line up the decimal points.
15.2 − 7.93
Line up the decimal points.
15.2 − 7.93
15.20−7.93
Fill in with zeros.
15.2 − 7.93
15.20−7.93
Fill in with zeros.
15.2 − 7.93
15.20−7.93
Add or subtract normally
15.2 − 7.93
15.20−7.93
Add or subtract normally
15.2 − 7.93
15.20−7.93
7 27
Place the decimal point under the other decimal points.
15.2 − 7.93
15.20−7.93
7 27
Place the decimal point under the other decimal points.
15.2 − 7.93
15.20−7.93
7.27
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
24.5 – 13
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
16.8 + 4.72
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
143.2 + 4.18
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
35 – 4.5
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
2.14 + 8.4
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
9 – 3.65
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
4.02 + 0.75
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
8.4 – 2.13
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
5 + 0.52
Line up the decimal points.
Fill in with zeros. Add or subtract
normally. Place the decimal
point under the other decimal points.
12 – 0.68
Multiplying Decimals
Remove any extra zeros.
0.54 x 1.20 .54 x 1.2
0.064 x 2.09 .064 x 2.09
340 x 0.50 340 x .5
4.03 x 6.30 4.03 x 6.3
Remove any extra zeros.
0.70 x 2.05 .7 x 2.05
0.003 x 1.10 .003 x 1.1
500 x 2.70 500 x 2.7
0.082 x 0.09 .082 x 0.09
Find the number that has the most digits NOT INCLUDING zeros on the front.
.54 x 1.2
2 digits 2 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
.064 x 2.09
2 digits 3 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
340 x .5
3 digits 1 digit
Find the number that has the most digits NOT INCLUDING zeros on the front.
4.03 x 6.3
3 digits 2 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
.7 x 2.05
1 digit 3 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
.003 x 1.1
1 digit 2 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
500 x 2.7
3 digits 2 digits
Remove any extra zeros.
0.47 x 0.2
Remove any extra zeros.
0.47 x 0.2
Find the number that has the most digits NOT INCLUDING zeros on the front.
0.47 x 0.2
Find the number that has the most digits NOT INCLUDING zeros on the front.
0.47 x 0.2
2 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
0.47 x 0.2
2 digits 1 digit
Put that number on top lining up the right side of the problem.
0.47 x 0.2
2 digits 1 digit
Put that number on top lining up the right side of the problem.
.4 7x .2
Multiply normally.
.4 7x .2
Multiply normally.
.4 7x .29 4
Count the total number of decimal places in the problem.
.4 7x .29 4
Count the total number of decimal places in the problem.
.4 7x .29 4
2 decimal places
Count the total number of decimal places in the problem.
.4 7x .29 4
2 decimal places
+1 decimal place
Count the total number of decimal places in the problem.
.4 7x .29 4
2 decimal places
+1 decimal place3 decimal places
Put that many decimal places in the answer.
.4 7x .29 4
2 decimal places
+1 decimal place3 decimal places
Put that many decimal places in the answer.
.4 7x .29 4
2 decimal places
+1 decimal place3 decimal places
1 decimal place
Put that many decimal places in the answer.
.4 7x .29 4
2 decimal places
+1 decimal place3 decimal places
2 decimal places
Put that many decimal places in the answer.
.4 7x .2
.0 9 4
2 decimal places
+1 decimal place3 decimal places
3 decimal places
Put that many decimal places in the answer.
.4 7x .2
.0 9 4
Remove any extra zeros.
3.45 x 0.004
Remove any extra zeros.
3.45 x 0.004
Find the number that has the most digits NOT INCLUDING zeros on the front.
3.45 x 0.004
Find the number that has the most digits NOT INCLUDING zeros on the front.
3.45 x 0.004
3 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
3.45 x 0.004
3 digits 1 digit
Put that number on top lining up the right side of the problem.
3.45 x 0.004
3 digits 1 digit
Put that number on top lining up the right side of the problem.
3 . 4 5x . 0 0 4
Multiply normally.
3 . 4 5x . 0 0 4
Multiply normally.
3 . 4 5x . 0 0 41 3 8 0
Count the total number of decimal places in the problem.
3 . 4 5x . 0 0 41 3 8 0
Count the total number of decimal places in the problem.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
Count the total number of decimal places in the problem.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal places
Count the total number of decimal places in the problem.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal places5 decimal places
Put that many decimal places in the answer.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal places5 decimal places
Put that many decimal places in the answer.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal places5 decimal places
1 decimal place
Put that many decimal places in the answer.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal places5 decimal places
2 decimal places
Put that many decimal places in the answer.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal place5 decimal places
3 decimal places
Put that many decimal places in the answer.
3 . 4 5x . 0 0 41 3 8 0
2 decimal places
+3 decimal place5 decimal places
4 decimal places
Put that many decimal places in the answer.
3 . 4 5x . 0 0 4
.0 1 3 8 0
2 decimal places
+3 decimal place5 decimal places
5 decimal places
Put that many decimal places in the answer.
3 . 4 5x . 0 0 4
. 0 1 3 8 0
Remove any extra zeros.
3.40 x 1.98
Remove any extra zeros.
3.40 x 1.98
Find the number that has the most digits NOT INCLUDING zeros on the front.
3.40 x 1.98
Find the number that has the most digits NOT INCLUDING zeros on the front.
3.40 x 1.98
2 digits
Find the number that has the most digits NOT INCLUDING zeros on the front.
3.40 x 1.98
2 digits 3 digits
Put that number on top lining up the right side of the problem.
3.40 x 1.98
2 digits 3 digits
Put that number on top lining up the right side of the problem.
1 . 9 8x 3 . 4
Multiply normally.
1 . 9 8x 3 . 4
Multiply normally.
1 . 9 8x 3 . 47 9 2
Multiply normally.
1 . 9 8x 3 . 47 9 2
5 9 4 0
Multiply normally.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
Count the total number of decimal places in the problem.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
Count the total number of decimal places in the problem.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
2 decimal places
Count the total number of decimal places in the problem.
1 .9 8x 3 . 47 9 2
5 9 4 06 6 3 2
2 decimal places
+1 decimal place
Count the total number of decimal places in the problem.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
2 decimal places
+1 decimal place3 decimal places
Put that many decimal places in the answer.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
2 decimal places
+1 decimal place3 decimal places
Put that many decimal places in the answer.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
2 decimal places
+1 decimal place3 decimal places
1 decimal place
Put that many decimal places in the answer.
1 . 9 8x 3 . 47 9 2
5 9 4 06 6 3 2
2 decimal places
+1 decimal place3 decimal places
2 decimal places
Put that many decimal places in the answer.
1 . 9 8x 3 . 47 9 2
5 9 4 06.6 3 2
2 decimal places
+1 decimal place3 decimal places
3 decimal places
Put that many decimal places in the answer.
1 . 9 8x 3 . 47 9 2
5 9 4 06.6 3 2
Remove any extra zeros.Find the number that
has the most digits NOT INCLUDING zeros on the front.
Put that number on top lining up the right side of the problem.
Multiply normally.Count the total decimal
places in the problem.Put that many decimal
places in the answer.
