Adding and Subtracting Real Numbers Explained

What is the result of adding a positive and a negative number?

• The sum is the difference between the two numbers, with the sign of the larger absolute value.

• The sum is always negative.

• The sum is the product of the two numbers.

• The sum is always positive.

What is the first step in solving problems with mixed addition and subtraction?

• Group terms with different signs.

• Subtract the smaller number from the larger number.

• Rewrite the problem as addition only.

• Find the common denominator.

When adding numbers with like signs, what should you remember to do if the numbers are negative?

• Ignore the negative sign.

• Add the numbers and change the sign to positive.

• Subtract the numbers and keep the negative sign.

• Add the numbers and keep the negative sign.

In the practice problem involving fractions, what is the common denominator used?

• 4

• 9

• 5

• 2

How do you convert a subtraction problem into an addition problem?

• By changing the minus sign to a plus sign and adding the opposite of the number.

• By dividing both numbers by 2.

• By multiplying both numbers by 2.

• By adding the same number twice.

What is the result of 16.21 + 12.72 - 21.54?

• 8.39

• 7.39

• 6.39

• 5.39

Which of the following is the correct order from least to greatest: -1, 3/4, 5/8, 0.85?

• -1, 5/8, 0.85, 3/4

• -1, 5/8, 3/4, 0.85

• -1, 3/4, 5/8, 0.85

• -1, 0.85, 5/8, 3/4

What is the simplified form of -9/12?

• -1/3

• -3/4

• -2/3

• -1/2

Which is smaller: -4.8 or -0.75?

• They are equal

• Cannot be determined

• -4.8

• -0.75

If Jonah ran a race in 32.68 seconds and Gail finished 3.01 seconds after Jonah, how long did it take Gail to run the race?

• 36.69 seconds

• 35.69 seconds

• 34.69 seconds

• 33.69 seconds