Adding
Subtracting
Estimating Subtracting
Estimating Addition
Rounding
100

44,567+22,789=?

What is the sum?

What is 67356

100

99,999-66,789

What is 33210


100

Estamate 48,973-28,964

What is 20000

100

Estimate 45,274+997

What is 45,300+1,000=46,300

100

Round this in the tens place

89,679

What is 89,680

200

16,284+58,261=?

What is the sum?

What is 74545

200

75,063-63,374

What is 11689

200

estimate 87,304-74,307

What is 20,000


200

Estimate 73,576+11,999=

What is 70,000+10,000=80,000

200

Round in the hundreds place

988,926

What is 988,900

300

87,296+11,436=?

What is the sum?

What is 98732

300

89,606-42,785

What is 46821

300

estimate 85,465-12,946

What is 80,000

300

Estimate

64,344+13,253

What is 60,000+10,000=70,000

300

Round in the thousands place.

879,996

What is 880,000

400

47,658+23,611=?

What is the sum?

What is 71269

400

98,009-78,975

What is 19034

400

estimate 82,746-63,486

What is 900,000-60,000=30,000

400

Estimate.

93,369+3,674

What is 93,000+4,000=97,000

400

Round the ten thousands place

72,745

What is 70,000

500

78,123+12,543=?

What is the sum?

What is 90666

500

86,735-75,886

What is 10849

500

estimate 84,768-6,537

What is 85,000-7,000=78,000

500

Estimate.

56,112+23,748=

What is 60,000+20,000=80,000

500

Round in the ten thousands place

97,695

What is 100,000

M
e
n
u