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Estimate
Algebra
Standard Algorithm
Estimate or Exact
100

30 x 10 =

What is 300?

100
32 x 8 =
What is 30 x 8 = 2,400?
100

Solve. n x 3 = 12

What is n = 4?

100

Solve: 436 x 2 =

What is 872?

100

Is an estimate or exact answer needed to solve this problem? 

Chloe and her two sisters each have $423 in their savings accounts. About how much money do they have altogether?

What is estimate.

200
6 x 200
What is 1,200?
200
42 x 5 =
What is 40 x 5 = 200?
200

Solve. b x 3 =24.

What is b = 8?

200

Solve: 7,291 x 3 =

What is 21,873?

200

Is an estimate or exact answer needed to solve this problem?

Every fourth class at Joy's school has 999 unit cubes in the classroom's manipulative kit. There are five fourth grade classes. How many unit cubes are there altogether?

What is exact?

300
5 x 600
What is 3,000?
300
67 x 8 =
What is 70 x 8 = 560?
300

If a cheetah can run 108 feet per second, how far can they run in 6 seconds?

What is 648 feet?

108 x 6 = f

f = 648 feet

300

Solve: 5,042 x 5 =

What is 25,210?

300

Chloe and her two sisters each have $423 in their savings accounts. About how much money do they have altogether?

What is $1,200?

423 x 3 = m

400 x 3 = m

m = $1,200

400
7 x 4,000?
What is 28,000
400
893 x 30 =
What is 900 x 3 = 2,700?
400

About 20 inches of rain falls monthly in a coastal rain forest. About how many inches is that yearly?

What is about 240 inches?

20 x 12 = r

r = 240 inches

400

Solve: 48,004 x 6 =

What is 288,024?

400

Every fourth class at Joy's school has 999 unit cubes in the classroom's manipulative kit. There are five fourth grade classes. How many unit cubes are there altogether?

What is 4,995 unit cubes?

999 x 5 = u

u = 4,995 unit cubes

500
40 x 900
What is 36,000?
500
8,251 x 6 =
What is 8,000 x 6 = 48,000?
500

27 inches of rain falls monthly in a tropical rain forest. About how many inches is that yearly?

What is about 360 inches?

27 x 12 = r

30 x 12 = r

r = 360 inches

500

Solve: 23,407 x 9 = 

What is 210,663?

500

A school is buying computers for the school library. They will buy 5 all-in-one computers. Each computer costs $489. They will also buy 5 computer desks. Each desk costs $129. What will be the total cost of the computers and the desks? Is an estimate or exact answer needed?

What is exact; $3,090 for computers and desks?

(489 x 5) + (129 x 5) = s

2,445 + 645 = s

s = $3,090

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