Multiplication by 10, 100, 1000
Factors
multiples
Estimation of multiplication
Word Problems
100
30 x 6 =
180
100

List the factors of 8 from least to greatest

1, 2, 4, 8

100
List the first 5 multiples of 5.
5, 10, 15, 20, 25
100

Estimate the answer to 6 x 42 =

6 x 40 = 240

100
There are 8 students in the art club. There are 3 times as many students in the Chorus. How many students are in the chorus?
Art 8 Chorus ____ _____ _____ 8 x 3 = 24 There are 24 students in chorus.
200
60 x 4 =
240
200
List the factors of 12 from least to greatest.
1, 2, 3, 4, 6, 12
200

The following are multiples pf what number? 12, 14, 16, 18, 20

they are multiples of 2

200
Estimate the answer to 5 x 387 =
5 x 400 = 2,000
200
John has times as many rabbits as Julie. John has 6 rabbits. How many rabbits does Julie have?
6 John ___2___ ____2___ ____2___ Julie ___2___ n x 3 = 6 2 x 3 = 6 so Julie has 2 rabbits.
300

200 x 8 =

1,600

300
List the factors of 9 from least to greatest.
1, 3, 9
300
List the first 5 multiples of 7.
7, 14, 21, 28, 35
300

Estimate the answer to ... 9 x 8,321 =

9 x 8,000 = 72,000

300
Atlanta has 12,645 4th grade students. Harris county has 378 4th graders. How many more 4th graders does Atlanta have?
Atlanta ________12,645____________________ ______378____l---------------------------l Harris Co. ? 12,645 - 378 = 12,267 Atlanta has 12,267 more 4th graders
400
8,000 x 6 =
48,000
400

Is the number 33 prime or composite? List the factors.

composite 1, 3, 11, 33

400

Is 2,689 a multiple of 3? Think about the divisibility rule for 3.

No divisibility rule for 3: the sum of the digits must be a multiple of 3.

400
Mrs. Hense sells a roll of hay for $58. She says she will make $174 if she sell three rolls. Is her answer reasonable? Explain
Yes her answer is reasonable because.. 3 x 58 = 3 x 60 = 180 $180 is close to $174
400
Last month Kim trained 3 times as many dogs than cats. If the total number of cats and dogs she trained was 28, how many cats did Kim train?
Dogs: __n___ __n___ ___n__ Total of all is 28 Cats: ___n__ 4 x n = 28 n = 7 Kim trained 7 cats.
500
12,000 x 6 =
72,000
500
Is the number 23 prime or composite? List the factors.
prime 1, 23
500

Is 4,332 a multiple of 6? What is the divisibility rule for 6?

yes divisibility rule for 6: follow the 2 and 3 divisibility rules. 2: even number 3: sum of the digits is multiple of 3.

500
Mr. Brown sell horse supplies. A pair of riding gloves sells for $16. He says he will make $244 if he sells 9 pairs. Could this be true? Explain
No this is not true because... 9 x 16 = 9 x 20 = 180 $180 is not close to $244
500
At the dog show there are 4 times as many boxers than German Shepherds. If there are a total of 30 dogs, how many dogs are German Shepherds?
B __n__ __n__ _n__ __n__ total dogs 30 GS __n__ 5 x n = 30 n = 6 6 dogs are German Shepherds
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