Estimating
Estimate the sum.
741.26
+ 103.75
800
Find the sum.
0.27+0.19 =
Make a quick sketch
0.46
Find the Sum
97.65 + 23.08 =
120.73
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
Use Mental Math to find the missing number.
9.2 + ___ +2.5 = 15.8
Estimate the difference
89.5
- 41.8
50
Find the differencе.
2.52-1.36 =
Make a quick sketch
1.16
Find the difference. Then check your answer.
86.5
- 49.4
37.1
37.1 + 49.4 = 86.5
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
Describe what a minuend and subtrahend are.
Minuend is your starting number in a subtraction equation, the larger number. The subtrahend is what is being subtracted from the minuend.
Estimate the difference.
13.47-9.82=
3
How do you check to see if your answer is "reasonable"?
You estimate first to find the sum or difference. Then compare to your actual sum or difference. If your estimate is close, your answer is reasonable.
Find the difference. Then check your answer.
37.82
- 5.07
32.75
32.75 + 5.07 = 37.82
Emma bought a sandwich for $4.75 and a drink for $1.60. How much did she spend in total?
$4.75 + $1.60 = $6.35
Use Mental Math to find the sum.
6.3 + 2.98 + 5.7 =
14.98
Estimate the sum.
64.9+17.5 =
80
Find the sum. Check whether your answer is reasonable.
10.36
+ 0.29
10.65
Evaluate. Check whether your answer is reasonable.
9.28 − 5.4 − 2.75 =
1.13
A turtle crawled 2.35 meters in the morning and 1.8 meters in the afternoon. How far did it crawl altogether?
2.35 + 1.80 = 4.15 meters
Use Mental Math to find the difference.
25.7 − 14.9 =
10.8
Dion 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, b, d
Find the sum. Check whether your answer is reasonable.
461.2
+ 78.5
539.7
Evaluate. Check whether your answer is reasonable.
2 + 18.6 − 7.9 =
12.7
Liam ran 5.8 miles on Saturday and 3.25 miles on Sunday. How much farther did he run on Saturday?
5.80 − 3.25 = 2.55 miles
Evaluate. Check whether your answer is reasonable.
26 − 0.8 + 13=
38.3