3rd grade math review

What place value is the 2 in, in the number 624

• Ones

• Tens

• Hundreds

• Thousands 

Answer explanation

The 2 in the number 624 is in the Tens place value, as it represents 20 in the number.

Round to the nearest ten:
85

• 80

• 85

• 86

• 90

Answer explanation

To round 85 to the nearest ten, we look at the digit in the tens place, which is 8. Since 8 is closer to 10 than to 0, we round up to 90.

Tina gave her dog a bath Friday night.  She started bathing him at 8:30 p.m. and was done at 9:00 p.m.  How long did it take her to bathe her dog?

• 15 minutes

• 30 minutes

• 45 minutes

• 20 minutes

Answer explanation

It took Tina 30 minutes to bathe her dog, as she started at 8:30 p.m. and finished at 9:00 p.m.

Which of the following numbers will NOT round to 400 when rounding to the nearest hundred?

• 409
• 445
• 345
• 398

Answer explanation

345 is halfway between 340 and 350 so that means 345 rounds UP to 350.

Round to the nearest ten:
752

• 700

• 800

• 750

• 760

Answer explanation

To round 752 to the nearest ten, look at the digit in the tens place, which is 5. Since 5 or greater rounds up, the answer is 750.

Jason started baseball practice Saturday afternoon at the time shown on the clock. Practice ended at 4:25 p.m. How many minutes did Jason's baseball practice last?

• 15

• 25

• 35

• 45

Answer explanation

Jason's baseball practice started at 3:40 p.m. and ended at 4:25 p.m., lasting a total of 45 minutes (25 minutes + 20 minutes). Therefore, the correct answer is 45 minutes.

Jennifer begins flute practice at 4:05. She practices till 4:47. How long did she practice?

• 52 minutes

• 50 minutes

• 42 minutes

• 40 minutes

Answer explanation

Jennifer practiced from 4:05 to 4:47, which is a total of 42 minutes (47 - 5 = 42). Therefore, she practiced for 42 minutes.

Jayden mowed his lawn for 30 minutes. He finished mowing at 9:30 a.m. What time did he start mowing the lawn? 

• 10:00

• 9:00

• 9:30

• 3:30

Answer explanation

Jayden started mowing the lawn at 9:00 a.m. since he mowed for 30 minutes and finished at 9:30 a.m.

How many minutes are in an hour?

• 30 minutes
• 15 minutes
• 60 minutes
• 90 minutes

Imagine Samuel has a fish tank full of water and wants to know how much space the water occupies. Which measurement should he use?

Choose the correct unit:

• meters

• liters

• grams

• milliliters

Answer explanation

Think of a 2L of pop. 1,000mL = 1L