Mental Math
Using mental math, which number below would be the easiest to add to 6.75 because you can make a whole with the decimals?
A 4.5
B 2.45
C 1.25
D 1.8
C. 1.25
Ashanti has 2 textbooks in her backpack. The math book weighs 2.46 pounds and the science book weights 1.58 pounds. Estimate the total weight to the nearest half pound.
A 3 pounds
B 3.5 pounds
C 4 pounds
D 4.5 pounds
C. 4 pounds
One flat is equal to 1.
Represent the following equation on your board:
2.3 + .12
Solve!
2.3 + .12= 2.42
2 flats, 4 rods, 2 cubes
Anthony is saving money for a new bicycle. He has $46.38. He is planning to do some work for a neighbor tomorrow. The neighbor will give him $12.45 for the work. How much money will Anthony have after he does the work for the neighbor?
A $58.73
B $58.83
C $59.73
D $59.83
B. $58.83
A glass has 36.895 milliliters of water. The glass has 0.906 more milliliters than a cup. How much water is in the cup?
A 37.801 milliliters
B 36.999 milliliters
C 35.989 milliliters
D 35.189 milliliters
C. 35.989 mililiters
Sofia has $12.00. She wants to buy a game that costs $8.10. She used mental math and subtracted
$12.00 - $8.00 to find how much money she would have left. If Sofia wants to know the exact price, what does she need to do to her answer?
A Add 10 cents
B Add 90 cents
C Subtract 10 cents
D Subtract 90 cents
C. Subtract 10 cents
There are two cans of green beans in the pantry. The large can weighs 6.3 pounds. The small can weighs 0.906 pounds. Estimate the difference in the weights of the two cans to the closest pound.
A 6 pounds
B 5 pounds
C 4 pounds
D 3 pounds
B. 5 pounds
Joseph had $12.97. He earned some more money mowing the lawn for a friend. Now Joseph has $36.47. How much money did Joseph earn for mowing the lawn?
A $13.50
B $23.50
C $24.50
D $49.44
B. $23.50
A farmer sold 53.25 pounds of carrots and 29.4 pounds of asparagus to a restaurant. The restaurant needs 100 pounds of vegetables for next week. How many more pounds of these two vegetables does the restaurant need?
17.35 pounds
Using mental math, which number below would be easiest to add to 9.4 because you can make a whole with the decimals?
A 4.5
B 2.45
C 1.25
D 1.6
D. 1.6
Ms. Bowling has 3 books in her bag that weigh 2.61 kilograms each. Estimate the total weight of the books to the nearest half kilogram.
A. 6 kilograms
B. 6.5 kilograms
C. 7 kilograms
D. 7.5 kilograms
D. 7.5 kilograms
A chef mixed 16.62 milliliters of water, 4 milliliters of oil, and 2.3 milliliters of vinegar to add to a secret sauce. How much liquid did the chef add to the secret sauce?
A 18.96 milliliters
B 16.89 milliliters
C 20.62 milliliters
D 22.92 milliliters
D. 22.92 milliliters
Mr. Gutierrez paid three bills using his paycheck this week.
Car insurance cost $271.90
The water bill was $34.22
The electric bill was $94.18
What was the total amount Mr. Gutierrez spent on the three bills?
A $306.12
B $366.08
C $399.30
D $400.30
D. $400.30
Using mental math, which number below would be the easiest to add to 6.05 because you can make a whole with the decimals?
A 4.5
B 2.45
C 1.95
D 1.8
C. 1.95
Paran had $85.58. He bought a book for $24.98 and a pack of pens for $2.49. About how much money does Paran have left?
A Between $55.50 and $57.50
B Between $57.50 and $59.50
C Between $59.50 and $61.50
D Between $61.50 and $63.50
B. between $57.50 and $59.50
Slide 9
https://docs.google.com/presentation/d/1lc5D4dWMmGxhwupagdyc-zo0PVm4eLVIkh548lhEbMc/edit?usp=sharing
2.00-0.24
2-0.24
Tim earned $16 babysitting and $17.50 mowing a lawn. He paid $8.50 for a movie and bought a small popcorn for $1.95. How much money does Tim have left?
A $23.05
B $24.95
C $25.00
D $33.50
A. $23.05
How much more Vitamin B is in the multi-vitamin than Vitamin C?
Vitamin A: 3
Vitamin B: 3.208
Vitamin C: 0.06
Vitamin D: 0.6
A 3.148 grams
B 3.202 grams
C 3.248 grams
D 3.268 grams
A. 3.148 grams
Solomon has 2 cats. Tinker weighs 5.8 kilograms. Simba weighs 6.2 kilograms.
Use mental math to calculate the combined weight of Tinker and Simba. What is their total weight?
A 11 kilograms
B 11.28 kilograms
C 11.82 kilograms
D 12 kilograms
D. 12 kilograms
Carlos is planning to buy a new video game. He checked the price for two games that he would like to buy. The Super Mario game costs $56.48. The Zelda game costs $38.99.
Write an equation you could use to show how to estimate how much money Carlos will save if he buys the Zelda game rather than the Super Mario game?
Examples:
$56.00+$40.00
$56.50+$40.00
Haven is subtracting 24 hundredths from 2 wholes.
What is her answer? USE BASE TEN BLOCKS TO SOLVE.
1.76
2 flats - 2 tenths and 4 hundredths
or
2 flats -24 hundredths
Marcus has two new books for his college math classes. The Calculus book weighs 4.98 pounds. The Discrete Math book weighs 3.02 more pounds than the Calculus book. How much do the two books weigh altogether?
A 12 pounds
B 12.98 pounds
C 8 pounds
D 8.90 pounds
B. 12.98 pounds
Marites looked up the weight of US Coins. She found this information at the US Mint:
Penny: 2.5 grams
Nickel: 5 grams
Dime: 2.268 grams
Quarter: 5.67 gram
How much greater is the weight of a quarter than the combined weight of a dime and a penny?
0.902 grams greater