Estimate Decimal Sums and Differences

Connect Geoff and Andrea want to combine their money to buy pizza. Geoff has $5.95. Andrea has $8.30. Which benchmarks should they use to estimate the money they have?

• $6.00 + $8.25

• $5.75 + $8.00

• $6.00 + $8.50

• $5.00 + $8.00

Multi-Step Maiko wrote two songs. The first song was 2.9 minutes long. Then he added 0.4 minute. The second song was 5.6 minutes long. Then he subtracted 1.1 minutes from it. Use benchmarks to estimate the length of each song.

• first song: 2.5 minutes, second song: 4 minutes

• first song: 3.5 minutes, second song: 4.5 minutes

• first song: 3.5 minutes, second song: 7 minutes

• first song: 2.5 minutes, second song: 5.5 minutes

Jesse, Max, and Kalel each ate 0.32 of a pizza pie. Which number shows the best estimate of how much of the pie they ate together?

• 1.0

• 0.5

• 0.25

• 0.10

George is giving two speeches at school. The first was 3.4 minutes long. Then he added 0.9 minutes to the speech. The second speech was 4.1 minutes long. Then he subtracted 1.4 minutes from it. Use benchmarks to estimate the length of each speech.

• first speech: 4.0 minutes; second speech: 3.5 minutes

• first speech: 4.0 minutes; second speech: 3 minutes

• first speech: 4.5 minutes; second speech: 2.5 minutes

• first speech: 4.5 minutes; second speech: 3.5 minutes

Estimate the sum of 35.89 and 22.14

• 58

• 56

• 57

• 59

What is the best estimate of 0.94 + 2.66

• 2

• 3

• 4

Paula wants to buy 3 shirts and 2 belts. The shirts cost $16.89 each, and the belts cost $8.97 each. Paula has $45.Which of these amounts is the best estimate of how much more money Paula needs in order to buy the shirts and belts?

• $16

• $10

• $24

• $5

Ms. Chaney had $565.26 in her bank account. She spent $78.95 at TJ Maxx. Estimate how much money Ms. Chaney has left in her bank account.

• 486.31

• $500

• $490

• $480