Estimating Decimal Sums and Differences

What is the best estimate of this sum?9.91 + 12.3 = ______

• 19

• 20

• 22

Josh bought two T-shirt for $7.90 each and another T-shirt for $12.40. What is the best estimate of the total amount he spent?

• $28.00

• $24.50

• $20.30

• $20.00

Use WHOLE NUMBER estimation: 
8.4 + 4.3 

• 13

• 11

• 12.7

• 12

Tina had $167.98 worth of items in her shopping cart at Spend Mart. Before checking out, she decided to return to the shelves a novel that cost $6.99, a blender that cost $27.22, and a pair of shorts that cost $12.76. Which is the best estimate of the amount of money that Tina spent not including tax?

• $50

• $120

• $130

• $160

What is a reasonable estimate of the difference between 8.99 and 5.18?

• 4.00

• 14.00

• 2.7

• 8.00

What is a reasonable estimate of the sum of 15.66 and 9.88?

• 50

• 26

• 6

• .23

What is a reasonable estimate of the difference between 13.07 and 11.91?

• 24.00

• 1.00

• 5.00

• 7.25

What is a reasonable estimate of the sum of 5.63 and 9.99?

• 5.00

• 5.63

• 16.00

• 2.12

Round to the nearest WHOLE number to find the sum: 34.87 + 20.41

• 55

• 55.28

• 54

• 50

Round to the nearest WHOLE number to find the sum:

44.56 + 14.72

• 59.28

• 50

• 60

• 58