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Decimals
Order of Operations (PEMDAS)
Metric vs. Customary
Prime and composite
STAAR Questions
100


What is 7.5 + 2.3?

Answer: 9.8

100

Calculate: 

3 + 5 × 2?

Answer : 13

100

Convert 5 km to meters

Answer : 5000 meters 

100

List the first five prime numbers.

Answer: The first five prime numbers are 2, 3, 5, 7, and 11.

100

What is the value of this expression? 

3(25+19)+4(3)


Answer : 144

200

What is 6.8 - 4.2?

Answer: 2.6

200

Calculate :

  (4 + 6) ÷ 2?

Answer : 5

200

Convert 1500 m to cm

Answer: 150,000 cm

200

Which of the following is prime: 29, 30, 31?

Answer: 29 and 31 are prime numbers; 30 is a composite number.

200

Mr. Nolan paid $46.99 for each adult shirt and $24.65 for each youth shirt he bought. Mr. Nolan bought 2 adult shirts and 5 youth shirts.

How much money did he spend on these shirts?

Answer: $222.23
300

What is 3.6 × 4.2?

Answer: 15.12

300

Calculate:

 2 × (3 + 4) - 5?

Answer: 9

300

Convert 59,045 grams to kilograms.

Answer: 0.059045

300

This prime number is the sum of the first three prime numbers.

Answer: (2+3+5) = 10 

300

Kristin drinks 0.5 liter of orange juice with breakfast each day for 15 days. How many milliliters of orange juice does Kristin drink during the 15 days?

Answer: 7,500 mL

500

What is 9.2 x 4.50?

Answer: 41.4
500

Calculate: 

 8 - 2 × (3 + 1)?

Answer: 0 

500


What is the number of ounces in 3 pounds?

Answer: 48 

1 pound = 16 ounces 

500


Identify a composite number between 20 and 30 and explain why it is composite.

The composite numbers between 20 and 30 are:

21, 22, 24, 25, 26, 27, 28.

have more than two factors


500

What is the value of the expression shown? 

2 x [ 30-20 ÷(5x2) ]

Answer: 56 

1000

What is 4.5 + 2.75 - 1.5?

Answer: 5.75

1000

Calculate:  

(14 - 6 ) x 2 + 9 ÷ 3

Answer: 19

1000

How do you convert 10.50 kilometers to centimeters 

K H D B d c m 

Start in the letter K and move your decimal to the right. 

Answer: 1,050,000 cm 

1000

This composite number is the product of the first three prime numbers.

(2 × 3 × 5)

Answer: 30 

1000

Margaret opened a new case of lightbulbs. 

* The case contained 3 boxes of lightbulbs with 8 lightbulbs in each box. 

* Margaret threw 2 of these lightbulbs in the trash because they were damaged. 

* Then she took 7 of the lightbulbs out of the case. 

Which expression can be used to show that there are 15 lightbulbs still int he case?

a. 3 x 8 -2 +7

b. 3(8) - 2(7)

c. 3 x 8 - (2+7)

d. 3 + 8 - 2 + 7

Answer c. 3 x 8 - (2 + 7)

Here's why:

  • Margaret started with 3 boxes of 8 lightbulbs: 3×8=243 \times 8 = 243×8=24.
  • She threw 2 lightbulbs in the trash, reducing the total: 24−2=2224 - 2 = 2224−2=22.
  • Then she took 7 more lightbulbs out of the case: 22−7=1522 - 7 = 1522−7=15.

So, the expression 3×8−(2+7)3 \times 8 - (2 + 7)3×8−(2+7) correctly represents the situation.