3 digit -Sums
$254 + $105 =
$359
36 + 0 =
Estimate. Round each addend to the indicated
place value.
49 + 32; tens
50 + 30 = 80
3,112 + 2,890 =
6,002
The ice cream shop sold 87 chocolate ice cream
cones, 45 strawberry ice cream cones, and 92 vanilla ice cream cones. How many cones did they sell altogether?
87 chocolate + 45 strawberry + 92 vanilla = 224 cones.
$353 + $457 =
$810
8 + (2 + 3) =
(8 + 2) + 3 =
Associative Property
Estimate. Round each addend to the indicated
place value.
66 + 78; tens
70 + 80 = 150
8,038 + 1,976 =
10,014
Rex has $1,901 in his bank account on Monday.
On Tuesday, $4,174 is added to his account. How much money is in his account after he deposits all his money?
$1,901 + $4,174 = $6,075
$362 + $428 =
$790
55 + 0 =
Identity Property
Estimate. Round each addend to the indicated
place value.
347 + 479; hundreds
300 + 500 = 800
6,015 + 1,765 =
7,780
Carson earns $100 a month. In August, Carson
managed to save $73 of his $100. In September, he saved $15. How much money did he save over the two months?
$73 + $15 = $88
$158 + $223 =
$381
69 + 17 = 17 + 69
Commutative Property
Estimate. Round each addend to the indicated
place value.
538 + 192; hundreds
500 + 200 = 700
4,824 + 1,509 =
6,333
Ava’s mother is buying school supplies for her and
her sister. Each of them needs 10 pencils, 5 erasers, and 3 notebooks. How many supplies will her mother buy for the 2 girls?
20 pencils + 10 erasers + 6 notebooks = 36 pieces of supplies for the two girls.
$985+$136=
$1,121
5 + (9 + 1) =
(5 + 9) + 1 =
Associative Property
Estimate. Round each addend to the indicated
place value.
4,392 + 1,233 (hundreds)
4,400 + 1,200 = 5,600
3,425 + 3,814 =
7,239
Raina walked her dog for 52 minutes on Thursday,
46 minutes on Saturday, and 36 minutes on Sunday. About how many minutes did Raina walk her dog?
50 + 50 + 40 = 140 minutes
*Bonus points - 2 hours and 20 minutes