Math Olympics Week 5

Division Rules

100

When my DIVIDEND gets 10x bigger, my answer gets...

10x bigger

200

When my DIVISOR gets 10x bigger, my answer gets..

10x smaller

300

When my DIVIDEND gets 100x smaller, my answer gets...

100x smaller

400

When my DIVISOR gets 100x smaller, my answer gets...

100x bigger

500

I can do this to my expression to get ready of decimals in the divisor

Multiply both dividend and divisor by the same thing

Create an equivalent expression

Using Division Rules - Math Facts

100

30 ÷ 0.1

300

200

5.4 ÷ 0.06

90

300

6 ÷ 0.02

300

400

0.8 ÷ 0.04

20

500

5.6 ÷ 0.007

800

Dividing Decimals by whole numbers

100

2.4 ÷ 12

0.2

200

0.8  ÷ 16

0.05

300

12.21 ÷ 11

1.11

400

47.31 ÷ 57

0.83

500

96.2 ÷ 37

2.6

Estimate and Eliminate

100

0.7 ÷ 4

a.  17.5

b. 1.75

c. 0.175

d. 0.0175

C

200

8.1 ÷ 5 

a. 1.62

b. 0.162

c. 0.0162

d. 0.00162

A

300

2.4 ÷ 0.8

a. 300

b. 30

c. 3

d. 0.3

C

400

8.2 ÷ 0.9

a. 91.1

b. 9.11

c. 0.911

d. 0.0911

B

500

0.15 ÷ 0.05

a. 0.03

b. 0.3 

c. 30

d. 3 

D

Problem Solving

100

A rope 8.7 meters long is cut into 5 equal pieces. How long is each piece?  

1.74 meters

200

What is the length of a rectangle whose width is 17 inches and whose area is 582.25 square inches?

34.25 inches

300

30.48 kg of beef was placed into 24 packages of equal weight. What is the weight of one package of beef?

1.27 kg

400

A blue rope is three times as long as a red rope. A green rope is 5 times as long as the blue rope. If the total length of the three ropes is 508.25 meters, what is the length of the blue rope?

80.25 meters

500

A craft club makes 95 identical paperweights to sell. They collect $230.85 from selling all the paperweights. If the profit the club collects on each paperweight is two times as much as the cost to make each one, what does it cost the club to make each paperweight?

$1.215