Mastering Addition and Subtraction of Rational Numbers

What is the result of 18 minus 10?

• 28

• 8

• 18

• 10

How do you interpret 10 minus (-4)?

• 10 + 4 + 4

• 10 + 4

• 10 - 4 - 4

• 10 - 4

What is the result of adding two positive numbers?

• Depends on the numbers

• Always negative

• Zero

• Always positive

If you add -8 and 5, what is the result?

• -13

• 13

• 3

• -3

What is the result of adding -6 and 5?

• -11

• 1

• -1

• 11

When adding fractions, what must be the same?

• Numerators

• Denominators

• Both numerators and denominators

• None

What is the result of 2 minus 8 in fraction form?

• 6/9

• 2/3

• -2/3

• -6/9

How do you find a common denominator for fractions?

• Multiply the numerators

• Find the smallest number both denominators divide into

• Add the denominators

• Subtract the denominators

What should you do when adding decimals?

• Convert to fractions first

• Ignore the decimals

• Line up the decimals

• Add zeros to the end

What is the result of adding 6.8 and 14?

• 20.8

• 21.8

• 23.8

• 22.8