9/15/2014 1-1 A. Estimate Products

What operation?

Remember….

Rounding4 or less ≤ round DOWN5 or greater ≥ round UP

• Example 1- The record for the greatest distance traveled on a skateboard in 24 hours was set by James Peters in 2007. He traveled about 7.6 miles per hour. – Round 7.6 to the nearest whole number.– Estimate how many miles James Peters traveled in

24 hours.– Is your estimate higher or lower that the actual

distance he traveled? Explain.

- 8- About 24 × 8 = 192 miles- The estimate is higher than the actual distance

he traveled because 7.6 was rounded up.

2.) 9.6 × 1.8

3.) 4.2 × 3.1

4.) 68.4 × 21.3

20

12

1,400

Exit Ticket

1) A greyhound can travel 39.3 miles per hour. At this speed, about how far could a greyhound travel in 6.5 hours?

2) Suppose one U.S. dollar is equal to 5.3 Egyptian pounds. About how many Egyptian pounds would you receive for $48.50?

3) 4.8 × 3.2 4) 5.81 × 4 5) 57.32 × 32

About 280 miles

About 250 Egyptian pounds

15 24 1,800

9/15/2014 1-1 C. Multiply Decimals by Whole Numbers

• Method:– “lasso” the decimals – Multiply as usual– Plug in the decimal at the end

Examples

1) 4 × 0.83 2) 3 × 14.2 3) 8 × 4.47

3.32 42.6 35.76

Exit Ticket

1) 3 × 0.02

2) 0.12 × 8

3) 11 × 0.045

0.06

0.96

0.495

Ms. Meenan wants….

1) A stand up paddle board ($594.15)Buy 2

2) A bag of potato chips ($3.99) Buy enough for the class

3) A bedazzled collar for Miss Dixie ($13.49)Buy enough for her dog pals… Kupper, Diesel, Bailey.

Homework

• Pg. 27 #10-20 Evens • Pg. 34 #1-26 Evens • Period F- Study Quiz Tuesday!