Practice Set – Numbers
I passed Lesson 10 pretest.
Do pretest on page 39.
Extra Activity, optional (1, 2, 3, 4, 5, 6, 7, 8, 9).
11
I did not pass Lesson 10 pretest.
Do all of Lesson 11.
Speed Drill 11
Practice Set – Numbers
Introduced in Math 502, Lessons 3 and 11
Each digit of a number has a place value. On either side of the ones column, the place values
run in opposite directions.
We use s at the end of the whole number place values to the left of the decimal point.
We use ths at the end of the decimal place values to the right of the decimal point.
Place-value chart through thousandths
s
s
ths dth
nd reds
ed san
r
s
d
d
s
h
u
t
n ens ne
n
hu
tho
t
hu
o
ten
a
us
tho
2
9•1 0
3
Place-value chart through trillions
s
red s
ten
8 3 4, 2 9 7, 4 1 0, 5 8 6, 2 5 6
red
ten
nd
hu
e
on
trillions
red
ten
nd
hu
billions
Name the place value of each 8.
1. a. 4.185
2. a. 578.639
e
on
red
ten
nd
hu
millions
e
on
red
ten
nd
hu
e
on
nd
hu
thousands
hundreds
b. 9.238
b. 5.814
Write the digit that holds each place in the following number.
3. a. ten billions place
4. a. hundred trillions place
36
5. a. hundred billions place
298,731,364,501,240
b. trillions place
b. ten trillions place
b. billions place
es
on
Lesson 11
Introduced in Math 502, Lesson 7
Rules for writing decimals.
1. Write the part before the word and as you would any other whole number.
2. Write a decimal point for the word and.
3. Write the number after the and.
4. Add zeros when necessary to make the correct number of decimal places.
Write these decimal numbers.
6. a. Nine and four hundredths
b. Four and nine hundredths
8. a. Twenty-five and sixteen thousandths
b. Fifteen thousandths
7. a. Six hundred four thousandths
9. a. Two-tenths
b. Nine-tenths
b. Six hundredths
Introduced in Math 502, Lesson 14
Rules for writing large numbers.
1. To write large numbers from words, change the words to numbers,
writing a comma in place of every comma name.
2. If a comma name is skipped after the first comma name, you must
write 3 zeros and a comma for that comma name.
3. Every group of digits must have 3 digits. If only one or two digits are
named, add zeros for the missing digits.
Write these numbers.
10. Twenty-one billion
11. Four hundred eight trillion, eight hundred twenty-five million, forty-one
12. One trillion, seventy-two million, eight hundred thirty-four
13. Forty-five billion, two hundred sixty-eight thousand, six
14. Two trillion, two hundred eighty-three
15. Ten billion, five hundred ninety-two million, three hundred forty-five
37
Lesson 11
Introduced in Math 503, Lesson 8; Math 504, Lesson 13
To compare two decimals or to order decimals, it helps to annex zeros so that each number
has the same number of decimal places.
Compare 9.726, 9.7, 9.35.
9.726
9.700
9.350
largest
middle
smallest
Order these decimal numbers from greatest to least.
16. 7.07
17. 0.2
7.7
7.77
0.203
2.2
Write < , > , or = .
18. a. 0.45
0.398
7
0.3
b. 2.80
2.8
c. 8.1
6.756
d. 0.05
0.1
Introduced in Math 507, Lesson 2
Every whole number is divisible by itself and 1. 47 ÷ 47 = 1 and 47 ÷ 1 = 47.
A number that is divisible by no other number besides 1 and itself is called a prime
number. A number that is divisible by some other number besides 1 and itself is called
a composite (käm • päå • zßt ) number.
The numbers 0 and 1 are neither prime nor composite.
Any number greater than 7 that is divisible by 2, 3, 5, or 7 is composite. If a number under
100 is not divisible by 2, 3, 5, or 7, it is a prime number.
Label each number P for prime or C for composite. If you write C, also write 2, 3, 5,
or 7 to show the key factors.
19. a. 21
b. 28
Label each number P for prime or C for composite.
20. a. 52
38
b. 29
c. 34
c. 17
d. 3
e. 42
Lesson 11
Pretest – Ratios and Proportions
12
Ask your teacher to initial the circle before you begin this pretest.
Multiply by 3 to make larger equivalent ratios.
1. a.
5
2
1
1
b.
=
=
Reduce these ratios to simplest form.
2. a.
9
3
b.
=
Solve these proportions.
3. a.
4 cars
6 people
n=
=
n cars
15 people
16
14
=
Set up proportions and solve.
c.
(1 point each.) [4]
c.
(1 point each.) [3]
b.
(1 point each.) [4]
=
60 planes
4 airports
n=
3
10
=
d.
4
3
12
32
=
d.
10
2
120 planes
n airports
c.
3 people
1 Bible
n=
=
13
=
=
n people
3 Bibles
(1 point each.) [2]
4. Sam thought the ratio of sandwiches to firefighters should be 3 : 1. There were 18
firefighters battling the blaze. How many sandwiches should Sam bring?
n=
5. Mr. Gordon’s flock contains 4 geese for every 6 ducks. If he has 6 geese, how
many ducks does he have?
n=
Ask your teacher to look over this pretest
and mark the boxes on page 40.
I can have 13 answers correct.
I must have 12 answers correct to pass.
I have ____ correct.
39
I passed Lesson 11 pretest.
Do pretest on page 43.
Extra Activity, optional (1, 2, 3, 4, 5, 6, 7, 8, 9).
12
I did not pass Lesson 11 pretest.
Do all of Lesson 12.
Speed Drill 12
Practice Set – Ratios and Proportions
Introduced in Math 505, Lesson 9; Math 506, Lesson 6
We can write ratios in three different ways:
5:7
or
5 to 7
5
7
or
We say each one the same way: “five to seven.”
Follow these steps to make larger equivalent ratios.
1. Change the ratio to fraction form.
2. Multiply both terms of the ratio by the same number to get a larger equivalent ratio.
5:3
5
3
5×4
20
12
3×4
Multiply by 5 to make larger equivalent ratios.
1. a.
1
4
=
b.
7
2
=
2 to 7
c.
3
6
2
7
2×3
7×3
d.
=
Introduced in Math 506, Lesson 9
12:18
Follow these steps to reduce a ratio to simplest form.
6
21
12
18
1. Change the ratio to fraction form.
2. Divide both terms of the ratio by the same
number until it is in simplest from.
Reduce these ratios to simplest form.
2. a.
40
6
18
=
b.
200
300
=
16 to 4
c.
10
8
=
16
4
d.
2
3
=
12 ÷ 6
18 ÷ 6
16 ÷ 4
4÷4
8
12
=
2
3
4
1
Lesson 12
Introduced in Math 506, Lesson 12
To find the missing term in a proportion, sometimes you must divide and sometimes you must
multiply.
12
?
18 = 3
12
18
12 ÷ 6
=
18 ÷ 6
Solve these proportions.
3. a.
4 cm width
5 cm length
n=
=
8 cm width
n cm length
b.
2
3
2
3
2
10
3 = ?
4 L water
32 mL fertilizer
n=
=
n L water
16 mL fertilizer
2×5
c.
=
3×5
5 cups rice
2 cups beans
n=
10
15
=
25 cups rice
n cups beans
Introduced in Math 507, Lesson 1
Sometimes you must cross multiply and divide to find the missing term in a proportion.
4 cabbages
20 rupees
=
3 cabbages
n
Solve these proportions.
4. a.
2 sheep
6 goats
n=
=
5 sheep
n goats
3 × 20 = 60
Step 1
60 ÷ 4 = 15
Step 2
Multiply the diagonal
that has no missing number.
Divide the product from Step 1
by the number that is left.
n = 15
b.
75¢
3 oranges
n=
=
n
7 oranges
c.
7 books
14 students
n=
=
3 books
n students
41
Lesson 12
Introduced in Math 507, Lesson 11
To set up a proportion, use a variable such as n for the missing number.
It is important to keep the units of both ratios in the same place
in the proportion. The top units of both ratios must be the same,
3 adults
18 adults
16 children = n children
and the bottom units of both ratios must be the same.
Set up proportions and solve.
5. The ratio is 2 cups flour to 1 cup sugar for a cake. Brian used 40 cups of flour to bake
cakes at the bakery. How many cups of sugar did he use?
n=
6. Vince mixed 2 parts yellow paint with 3 parts red paint to get orange for the sunset he
was painting. If he started with 50 mL of yellow paint, how much red paint did he add
to the mixture?
n=
7. The fuel mixture for the boat is 5 parts gasoline to 2 parts oil. Gene poured 4 gallons
of oil into the tank. How much gasoline should he add?
n=
8. Randy is 5 feet tall and his shadow is 7 feet long. The shadow of an electric pole
is 35 feet long. How tall is the pole?
n=
42
Pretest – Rounding and Estimating
Ask your teacher to initial the circle before you begin this pretest.
Round to the nearest . . .
1. thousand.
2. ten.
3. hundred thousand.
4. ten thousand.
5. hundred.
Round to the nearest . . .
6. thousandth.
7. tenth.
8. hundredth.
(1 point each.) [10]
a. 120,583
b. 49,063
a. 589,624
b. 8,639,712
a. 45,637
9. a. 18.673
10. a. 9.9486
20
22
b. 8,397
a. 115,439
b. 896,472
a. 115,439
b. 49,063
(1 point each.) [6]
a. 0.2298
b. 0.5107
a. 0.728
b. 0.1843
a. 0.949
Round to the nearest whole number.
Lesson 12
b. 0.76
(1 point each.) [6]
b. 9.43
b. 28.9
Ask your teacher to look over this pretest
and mark the boxes on page 44.
c. 3.91
c. 10.321
I can have 22 answers correct.
I must have 20 answers correct to pass.
I have ____ correct.
43
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