Rational Numbers OperationsQR Activity Review

Adding Rational Numbers Rule:

O Same signs, add and keep. Different signs subtract. Use the sign of the bigger number, then you’ll be exact!

O Decimals: Line them up!O Fractions: Find a common

denominator! O Mixed numbers: Change to improper

Fractions!

Subtracting Rational Numbers Rule.

O L.C.O. (Leave. Change. Opposite.) Leave the first number alone, change subtraction to addition, and find the opposite of the 2nd number.

O Then follow the adding rules!

Multiplying Rational Numbers Rule:

O Use the Tic-Tac-Toe board! O Decimals: Multiply like normal. Count

the number of decimal places in the problem to the right, and move that many places to the left in your answer.

O Fractions: Multiply straight across and reduce if possible.

O Mixed numbers: Change to improper fractions first, then follow fraction rule.

Dividing Rational Numbers Rule:

O Use the Tic-Tac-Toe board!O Decimals: Make the outside number a

whole number. What you do outside of the box you must do inside the box. Move your new decimal straight up and divide like normal.

O Fractions: K.C.F. (Keep. Change. Flip.) Keep the first number. Change division to Multiplication. Flip the 2nd fraction. Then multiply straight across. Reduce if possible

O Mixed Numbers: Make improper first, then follow fraction rule.

QR ACTIVITYO Students will be placed in assigned

group.O Each group will have an iPad. Each

person will have an answer sheet. O Group will scan QR code, work out

the problem together, and record your answer.

Question 1O Write the rational number as a

decimal: 5/8

O Answer: 0.625

Question 2O Write the rational number as a

decimal: -1 2/3

O Answer: - 1.66…

Question 3O Write the decimal as a fraction or

mixed number in simplest form: -0.35

O Answer: -7/20

Question 4O Write the decimal as a fraction or

mixed number in simplest form: 24.2

O Answer: 24 1/5

Question 5O Add: 7/10 + (-3/5)

O Answer: 1/10

Question 6O Add: -2.4 + (-1.2)

O Answer: -3.6

Question 7O Subtract: -3/4 -- 1/6

O Answer: -11/12

Question 8O Subtract: 3.4 – 7.21

O Answer: -3.81

Question 9O Multiply: (-3/5)(4/7)

O Answer: -12/35

Question 10O Multiply: -1.3 * 4.25

O Answer: -5.525

Question 11O Divide: -4/11 divided by 2/3

O Answer: -6/11

Question 12O Divide: 6.4 divided by (-0.8)

Answer: -8