4.3 Rounding to Estimate

Round to the nearest ten to estimate:

32x 18=

• 30x20=600

• 30x20=6000

• 30x10=300

• 30x18= 540

Round to the nearest ten to estimate:

24x 8=

• 30x10=300

• 20x10=2000

• 20x10=200

• 25x10=2500

Mrs. Isayeva has 13 classes on her schedule. There are 26 students in each class. Mrs. Isayeva wants to give pencil prize to each of her students. How many pencils does Mrs. Isayeva need . Round to the nearest 10 and use mental math to estimate.

• 10x30=300

• 10x30=3000

• 10x20=200

• 13x26=338

Mrs. Skiadis has 42 students. Each student completes 16 assignments a week. How many assignments does Ms. Skiadis needs to check each week. Round the the nearest ten and use mental math to estimate

• 40x20=600

• 17x42=714

• 40x20=8000

• 40x20=800