Adding & Subtracting Decimals All Problems
What is 2.4 + 17.83?
20.23
What is 19.32 x 100?
1,932
(This can be done mentally!)
What is 6.73 divided by 100?
0.0673
(This can be done mentally!)
Kacey is baking. A recipe requires 6.8 cups of flour to make a serving. She only wants to make 0.8 of the recipe. How many cups does she need?
She needs 5.44 cups.
You do 6.8 x 0.8 because she is only cooking part OF the recipe. 0.8 is less than 1 whole, so your answer needs to be smaller than the total, which was 6.8.
How many decimal places will there be in the product shown below? 2.4 x 19.52 =
3
You move the decimal point out three spaces. The answer to 24 x 1952 = 46848 (with a hiding decimal point next to the ones place), and then you move the decimal back three spaces to 46.848, which makes sense because the problem is similar to 2 x 20 = 40.
What is 60 - 7.83?
52.17
What is 98.4 x 0.43?
42.312
(Reminder: The reason your answer got smaller was because you were multiplying by a number less than 1!!!)
What is 19.9 divided by 10.2, rounded to the nearest hundredth?
1.95
Trick is designing his car for science class. He made the car 2 feet long (woah!). He wants to put a light bulb every 0.4 feet. How many light bulbs should he use?
5 light bulbs.
You do 2 divided by 0.4 because you are SPLITTING the car into EQUAL sections. Try drawing it if this did not make sense to you! :)
What factor could be used to make the equation true? ______ x 0.09 = 0.324
A) 1.5 B) 2.8 C) 3.6 D) 2.2
C, 3.6 -- 3.6 x 0.09 = 0.324
You know this because 9 x 36 = 324. You can just try all of the answer choices, or just do the quotient divided by the given factor, equals the unknown factor.
Olivia walked 6.67 miles. Then she walked another 0.7 miles. How many miles did she walk in all?
7.37 miles
You add the two numbers together.
What is 66.92 x 9.9?
662.508
What is 89.6 divided by 0.3, rounded to the nearest tenth?
298.7
(Reminder: The reason your answer got bigger was because you were dividing by a number less than 1!!!)
Chris has 6 mini candy bars. Each candy bar is 1.37 cm. If he lays them end-to-end, how many cm would it be in all?
8.22 cm
You multiply because you are PUTTING TOGETHER EQUAL GROUPS! Draw it if you are having trouble with this! :)
9 1/2 + (10 1/3 - 4 4/5) =
15 1/30
It rained 1.4 inches on Monday. On Tuesday, it rained .68 inches less than on Monday. How much did it rain on Tuesday?
It rained 0.72 inches on Tuesday.
You subtract Tuesday from Monday.
What is 3.02 x 5.7?
17.214
What is 35 divided by 7.02, rounded to the nearest whole number?
5
Albie is making goody bags for his birthday party. He needs to separate 8.4 pounds of candy into 0.7 pound piles. How many goody bags can he make with this?
12 goody bags
You do division because you are SPLITTING the candy into EQUAL groups!
Sarah and Isabella went to Starbucks for lunch. To determine how much money to leave as a tip, they multiplied the bill by 0.15 (This would be a 15% tip). How much money should she leave as a tip if the bill is $20?
$3
0.15 x 20 = 3.00. The product is smaller than 20 because you are only taking a PART of it (less than 1 whole).
Alexa bought 8.63 ounces of chocolate chips. The next day she baked cookies and used 1.9 ounces of them. How many ounces does she have now?
Alexa has 6.73 ounces left.
You take away what she used from what she bought.
What is 19.8 x 6.74?
133.452
What is 93.4 divided by 5.7 rounded to the nearest thousandth?
16.386
Mrs. Lawley's 5th graders are selling treats at a bake sale. The students sell the following amount of treats: 16 cookies, each costs $0.53; 23 brownies, each costs $1.25; 13 cake pops, each costs $0.68. How much money did they make in all?
In total, they made $46.07.
The cookies cost $8.48, the brownies cost $28.75, and the cake pops cost 8.84. You find this by multiplying how many they sold by how much each one costs. After adding them all, you get the total answer.
What is 763 x 925?
705,775