Exponents
Estimating
Multiply by groups of 10
Greater multiplication
Word problems
100

102

100

100

652 x 24

700 x 20 = 14000

100

256 x 100

25,600

100

832 x 7

5,824

100

John's bus can hold 64 students, he makes 253 trips with a full bus.  How many students did he drive?

64 x 253 = 16,192

200

103

1000

200

812 x 66 

800 x 70 = 56000

200

6589 x 1000

6,589,000

200

564 x 45

25,380

200

There are 14 classroom and each class has 21 students.  

14 x 21 = 294

300

6 x 103

6 x 1000 = 6000

300

5426 x 62

5000 x 60 = 300,000

300

598 x 80

(598 x 8) x10

4784 x 10

47840

300

8954 x 6

83,724

300

June has 23 containers of paper clips and each one has 6524 paper clips in it.  How many does she have?

23 x 6524 = 150,052
400

156 x 105

156 x 100,000 = 15,600,000

400

1564 x 55

2000 x 60 = 120,000

400

598 x 500 

(598 x 5) x 100

2990 x 100

299,000

400

623 x 59

36,757

400

You buy a tablet for $235 you also buy a game system for three times that about.  How much money do you need to buy these items?

235 + (235 x 3)

235 + 705

940

500

7952 Multiple the number in the hundreds place value by 103

9 x 1000 = 9000

500

What is a reasonable estimate for 88,951 x 652

90,000 x 700 = 63,000,000

500

8976 x 7000

(8976 x 7) x 1000

62,832 x 1000

62,832,000

500

7523 x 74

556,702

500

You are selling food on a food truck.  Hot dogs are $12 and chicken nachos are $34.  You sell hot dogs to 294 people and chicken nachos to 56 people.  How much money did you make?

12 x 294 =3528

34 x 56 = 1904

3528 + 1904 = $5432