Mental Math
8.6 +23.4 + 1.4
33.4
Round to nearest ten to estimate.
358 + 293
650
Find the sum
7.06 + 0.85
7.91
Find the Difference
24.07-5.31
18.76
Lucy bought 2.12 pounds of pears and 4.35 pounds of apples. Fid how many more pounds of apples than pears Lucy bought.
2.23 pounds
15.3 + 1.1 +1.7
18.1
Round to nearest whole number to estimate the difference
15.01 - 4.4
11
Find the sum
53.2 + 29.4
82.6
Find the Difference
51.92 - 28.03
23.89
Kayla's dollhouse has 15.15 square feet downstairs and 6.45 square feet upstairs. What is the estimated total area if you round the decimals to the nearest tenth?
21.7 square feet
27 - 9.9
17.1
Round to the nearest tenth to estimate the sum
80.01 + 2.89
82.9
Find the sum
0.02 + 12 + 0.88
12.9
Find the Difference
23.6 - 8.87
14.73
Ed is training for a race. He ran 12.56 miles on one day, 12.98 miles the second, and 13.04 miles the third day.
A. What is his combined distance for the first three days?
B. How much farther did he run the second day than the first?
A. 38.58 miles total
B. 0.42 miles farther
13.5 + 5.7 + 36.5
55.7
Round to the nearest thousand to find the difference
25,003 - 12,900
12,000
Find the sum
16.8 + 17 + 3.94 + 101.68
139.42
Find the Difference
127.3 - 16.65
110.65
Amber bought a hardcover book for $23.70 and a paperback for $6.91.
A. How much did she spend in all?
B. If she paid with 2 twenty-dollar bills, how much change did she get?
A. $30.61 spent
B. $9.39 change
205.4 - 99.7
105.7
Use compatible numbers to estimate the difference
22.4 - 16.2
5 or 6
Find the Sum
10,892.03 + 89.2 + 345,678.99
356,660.22
(35.8 + 358) - 234.92
158.88
Daria bought a skein of alpaca yarn for $47.50, a skein of angora yarn for $32.54, a skein of wool yarn for $16.87 and a pair of knitting needles for $3.86. She pays with a 100 dollar bill and a 20 dollar bill.
A. How much did she spend in all?
B. How much change did she receive?
A. $100.77 total cost
B. $19.23 change