Review

1. Is 30 a common multiple of 2 and 5? How do you know?

Find the LCM or Least Common Multiple of each set of numbers.

5, 7 4, 9 2, 6, 8

Multiples of 10, 100, and 1000

By: Miss B

When multiplying by multiples of 10, 100, and 1000, first multiply the non-zero digits.

Then, count the number of zeros in both factors. Write that number of zeros in the product.

A fifth grader’s heart normally beats 90 times in 1 minute. How many times does it beat in 1 hour?

Can the product ever contain more zeros than the number of zeros in the factors?

Yes, if the product of the non-zero digits is itself a multiple of 10, for example, 4 x 5

80 x 90

90 x 90=

4 x 70

5 x 900

6,000 x 6

90 x 30

12 x 10

30 x 40

2 x 6000

60 x 20

60 x 50

80 x 200

90 x 70

2 x 5,000

50 x ____ = 2,500

4 x _____ = 160

___ x 90 = 18,000

___x 80= 4,000

___x 300 = 6,000

An adults heart pumps about 5 liters of blood every minute. About how much blood is pumped in an hour?

Problem Solving