Adding and Subtracting Decimals Answers

The closing amount of the Dow Jones Industrial Average on the stock market for four days is shown in the table below. DateClosing amount (in points)01/2713,895.9801/2813,881.9301/2913,954.401/3013,860.42Which best represents the greatest amount of change that took place from one day to the next day over the four-day period?

What is the sum of –356.1 + 258.6?

Which expression is represented by the number line?

Lori had $126.89 in her bank account. She deposited $21.49 into it and then wrote a check for her car repairs for $156.61. What was the ending balance in her account?

Nadia is mountain climbing. She started at an altitude of 19.26 feet below sea level and then changed her altitude by climbing a total of 5,437.8 feet up from her initial position. What was Nadia’s altitude at the end of her climb?

Which number line correctly shows –0.8 + 0.6?

Shen’s mother gave him $10 to go buy groceries. He picked up a gallon of milk for $3.49, three pounds of oranges that cost $1.14 per pound, and a box of cereal for $3.46. Shen used front-end estimation to determine whether he had enough money for the groceries. How much did he estimate the total cost would be?

What is the value of –112.84 – 54.14 – (–29.18)?

Aisha changed 1.45 + 2.38 to 1.5 + 2.4 in order to estimate the sum. What estimation method did she use?

The times for Erin’s five laps around the track were 56.6 seconds, 57.9 seconds, 57.5 seconds, 65.3 seconds, and 65.7 seconds. Using rounding to the nearest whole second as the only estimation technique, what is the total estimated time for Erin’s five laps in seconds?