Estimate Sums and Differences
Estimate the sum of:
741.26 + 103.75 =
845
10.36 + 0.29 =
10.65
99.2 - 8.6 =
90.6
Using Mental Math Solve:
6.3 + 2.98 + 5.7 =
14.98
Newton buys a board game for $9.99 and a pack of trading cards for $2.99. He gives the cashier a $20 bill. How much change does he recieve?
$7.02
Estimate the difference of:
89.5 - 41.8 =
48
461.2 + 78.5 =
539.7
582.58 - 33.21 =
549.37
Using Mental Math Solve:
9.1 + 4.57 +8.03 =
21.7
Descartes has $378.97 in his bank account. He withdraws $59.50 one day and then deposits $20.44 the next day. How much money is in his bank account now?
$339.91
Estimate the difference of:
13.47 - 9.82 =
3
97.65 + 23.08 =
120.73
37.82 - 5.07 =
32.75
Using Mental Math Solve:
25.7 - 14.9 +
10.8
A bowling alley charges $7.50 for each person to bowl and $2.25 to rent a pair of shoes. How much does it cost you and your friend to bowl and rent shoes?
$19.50
Estimate the sum of:
64.9 + 17.5 =
83
63.39 + 4.05
67.44
86.5 - 49.4 =
37.1
Using Mental Math Solve:
9.24 - 2.67 =
6.57
Newton pays for a new collar that cost $7.10, a bag of cat food that cost $5.49, and a box of cat treats with four $5 bills. His change is $4.02. How much does the box of cat treats cost?
$3.39
Descartes estimates a difference by rounding each number to the nearest whole number. His estimate is 6. Which problems could he have estimated?
A. 97.5 - 91.8
B. 10.3 - 4.6
C. 23.7 - 18.1
D. 7.2 - 0.8
A, C, and D
You want to conduct an experiment. You need 0.5 cup of water and the same amount of oil. How many cups of liquid do you need for the experiment?
1 cup
9.28 - 5.4 - 2.75 =
1.13
Using Mental Math Solve:
1.72 + 4 + 35.68 =
41.4
Your friend buys a scooter that cost $124.99 and a helmet that cost $27.50. Your friend has two gift cards that are worth the same amount. Your friend uses both gift cards and pays an additional $2.49. What is the amount on each gift card?
$75.00 each