Adding Decimals
What is the first step when adding decimals?
Line up the decimal points before adding
7.5 - 4.2
3.3
What is the first step in multiplying decimals?
Multiply the numbers as if they were whole numbers
What do you do with the decimal point in the quotient when dividing decimals?
Place the decimal point directly above its position in the dividend
Emma bought a notebook for $4.75 and a pen for $1.25. How much did she spend in total?
$6.00
4.2 + 3.8
8.0
What should you do if the top number has fewer decimal places than the bottom number when subtracting?
Add zeros to the top number to match the decimal places
How do you determine where to place the decimal point in the product?
Count the total number of decimal places in both factors and place the decimal in the product accordingly
7.2 ÷ 3
2.4
Liam had $20.00. He spent $7.89 on lunch. How much money does he have left?
$12.11
What do you do if the decimals have a different number of digits after the decimal point?
Add zeros to the shorter decimal to make them the same length
6.219
Do you need to line up the decimal points when multiplying decimals?
No, it is not necessary
What is the difference between dividing by a decimal and dividing by a whole number?
Dividing by a decimal requires adjusting the divisor to make it a whole number
A piece of fabric costs $3.75 per yard. How much would it cost to buy 4.5 yards?
$16.88
24.56 + 13.72 + 7.89
46.17
When subtracting decimals, what happens if you need to borrow?
You borrow from the digit to the left, just like with whole numbers
9.876 x 1.2
11.8512
12 ÷ 0.4
30.0
Sarah has 15.6 ounces of trail mix. She wants to divide it evenly into 4 bags. How many ounces will be in each bag?
3.9 ounces
123.456 + 78.901 + 12.345
214.702
45.7 - 12.581
33.119
23.456 x 0.89
20.87584
144 ÷ 0.12
1200
11.25 miles per gallon