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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