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Vocabulary
Powers of 10
Estimation
Equations
Word Problems
100
the answer to a multiplication problem
What is a product?
100

21 x 102

2,100

100

233 x 33

200 x 30 = 6,000

100

81 x 11

891

100

There are 8 Harry Potter movies. Each movie is about 133 minutes. How many minutes are all the movies combined?

Extra point: About how many hours are all the movies combined?

1,064 minutes

17.73 hours

200
the numbers that are multiplied
What are factors?
200

194 x 100

194,000

200

154 x 14

150 x 10 = 1,500

200

106 x 7

742

200

Jonas Brothers concert tickets are on sale for $45 each. The first day on sale they sold 817 tickets. How much money did they make?

$36,765

300
a letter that represents a number in an expression or equation
What is a variable?
300

100 x 54

54

300

27 x 191

30 x 200 = 6,000

300

439 x 22 = 

9,658

300

Harry cast 134 spells his first year at Hogwarts. Hermione cast 11 times as many. How many spells did Hermione cast?

1,474 spells

400
products found by breaking one of two factors apart and multiplying the other factor by each part
What are partial products?
400

810 x 103

810,000

400

244 x 48

200 x 50 = 10,000

400

280 x 66

18,480

400

The Great Hall at Hogwarts is getting a makeover. They are painting all 4 walls. Each wall has a length of 23 feet and a height of 34 feet. How many feet of wall do they have to paint in all?

23 x 34 = 782

782 x 4 = 3,128 feet

500
the result of using greater numbers to estimate a sum or product is called this
What is an overestimation?
500

30 x 1000

30,000

500

82 x 194

80 x 200 = 16,000

500

37 x 2,525 = 

93,425

500

There are 77 stores selling candy for Halloween. If each store sells 1,206 pounds of candy, how many pounds will they sell in total?

92,862 pounds