Property 7
Adding and Subtracting Decimals
To add or subtract decimals: Write in columns with decimal points aligned. Insert zeros on the right if necessary. Add or subtract. Align the decimal point in the answer.
Multiplying Decimals
Multiply the numbers as if they were whole numbers. Count the number of decimal places in each factor. The total of the decimal places is the number of decimal places in the product. Insert zeros on the left if necessary
Dividing Decimals
If the divisor is not a whole number, move the decimal point in both the divisor and dividend to the right as many places as necessary to make the divisor a whole number. Place the decimal point in the quotient above the decimal point in the dividend.
1.
\(0{,}5+7{,}2=?\)
2.
\(3{,}2+5{,}7=?\)
3.
\(2{,}73+35{,}8=?\)
4.
\(25{,}24+7{,}48=?\)
5.
\(2{,}7-1{,}92=?\)
6.
\(14{,}8-10{,}9=?\)
7.
\(3{,}2\cdot2{,}7=?\)
8.
\(1{,}2\cdot3{,}05=?\)
9.
\(2{,}3+3{,}1=?\)
10.
\(23{,}09\cdot0{,}1=?\)
11.
\(3{,}27\cdot2{,}4=?\)
12.
\((2{,}9+3{,}4)\cdot1{,}2=?\)
13.
\((12{,}1-2{,}1)\cdot(32{,}45)=?\)
14.
\((2+0{,}43):(3-2{,}55)=?\)