When adding and subtracting decimals on paper, it is important to ...
line up the decimals vertically
200
75.4+0.5919
75.9919
200
18.31-8.25
10.06
200
17.2(12.86)
221.192
200
What is the answer to a subtraction problem called?
difference
300
100.8+5.87
106.67
300
38.61-5.04
33.57
300
2.07*2.008
4.15656
300
What is the answer to an addition problem called?
sum
400
Lorena bought groceries for $102.34 and new shoes for $53.36. How much did Lorena spend on groceries and new shoes altogether? DON'T FORGET UNITS!
$155.70
400
Jamie buys 2.74 pounds of dried pinto beans and 4.05 pounds of dried lima beans. What is the difference between the weights of the beans that Jamie buys? DON'T FORGET UNITS!
1.31 pounds
400
A mine produces 42.5 tons of coal per hour. How much coal will the mine produce in 9.5 hours? DON'T FORGET UNITS!
403.75 tons
400
What is the answer to a multiplication problem?
product
500
The school is 3.2 blocks from Hector's house. How many blocks does Hector walk to go to and from school? DON'T FORGET UNITS!
6.4 blocks
500
Kelly's baby brother weighs 7.71 pounds. Her newborn kitten weighs 0.24 pound. How much more does Kelly's baby brother weigh than her kitten? DON'T FORGET UNITS!
7.47 pounds
500
Morgan bought 3.5 pounds of bananas at $0.51 a pound and 4.5 pounds of pineapple at $1.19 a pound. How much did she pay for the bananas and pineapple? (3 steps) DON'T FORGET UNITS!
$7.14
500
How do know where to put the decimal in a multiplication problem?
count the number of places after the decimal in the problem's numbers. add them together. this is the number of places you need in the product.