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## Adding And Subtracting FractionsPresentation Transcript

• Adding and Subtracting Fractions Criss-Cross Smiley Face Method by Mr. Hoover Click to begin
• Adding and Subtracting Positive and Negative Numbers
• Signs are the same: add the numbers and keep the sign.
• 2 + 3 = 5
• -2 – 3 = -5
• -2 + -3 = -5
• Signs are opposite: subtract the numbers and take the sign of the larger number.
• 8 – 5 = 3 (8-5 is 3, and the sign of the larger number is positive)
• 5 – 8 = -3 (8-5 is 3, and the sign of the larger number is negative)
Click to continue Skills Review
• Skills Review
• Multiplying Positive and Negative Numbers
• Signs are the same: the sign of the answer will be positive.
• 4 x 5 = 20
• -4 x -5 = 20
• Signs are opposite: the sign of the answer will be negative.
• 4 x -5 = -20
• -4 x 5 = -20
Click to continue
• Skills Review
• Adding, Subtracting, and Multiplying Positive and Negative Numbers
• Click on the correct answer.
• 5 + 2 =
0 1 2 3 4 5 6 8 9 10 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 7
• Skills Review
• Adding, Subtracting, and Multiplying Positive and Negative Numbers
• Click on the correct answer.
• 5 – 2
0 1 2 7 4 5 6 8 9 10 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 3
• Skills Review
• Adding, Subtracting, and Multiplying Positive and Negative Numbers
• Click on the correct answer.
• - 5 + 2 =
0 1 2 3 4 5 6 8 9 10 -1 -2 7 -4 -5 -6 -7 -8 -9 -10 -3
• Skills Review
• Adding, Subtracting, and Multiplying Positive and Negative Numbers
• Click on the correct answer.
• - 5 – 2 =
0 1 2 7 4 5 6 8 9 10 -1 -2 -3 -4 -5 -6 3 -8 -9 -10 -7
• You are correct!
• Go on to the next question.
• You are correct!
• Go on to the next question.
• You are correct!
• Go on to the next question.
• You are correct!
• Move on to the next section.
• Criss-Cross Smiley Face Method Click to continue 2 + 3 = 5 4 Step 1: Criss – multiply 2 x 4 and bring down + sign Step 2: Cross – multiply 3 x 5 Step 3: Smiley Face – multiply 5 x 4 Step 4: Solve and simplify if needed. Leave fraction as an improper fraction. 2 x 4 8 + 20 5 x 4 3 x 5 15 23 = 20
• Criss-Cross Smiley Face Method Click to continue 1 - 2 = 6 3 Step 1: Criss – multiply 1 x 3 and bring down - sign Step 2: Cross – multiply 2 x 6 Step 3: Smiley Face – multiply 6 x 3 Step 4: Solve and simplify if needed. Leave fraction as an improper fraction. 1 x 3 3 - 18 6 x 3 2 x 6 12 -9 = = 18 -1 2
• Practice Click on the correct answer. Leave fraction as an improper fraction. 1 + 3 = 5 4 OK, let’s practice what we just learned. = ? ? ? ? 4 9 4 20 19 9 19 20
• Practice Click on the correct answer. Leave fraction as an improper fraction. 2 - 2 = 3 5 = ? ? ? ? 0 15 4 15 0 -2 -4 15
• Practice Click on the correct answer. Leave fraction as an improper fraction. 6 + 4 = 7 3 = ? ? ? ? 24 21 46 21 1 1 24 10
• Practice Click on the correct answer. Leave fraction as an improper fraction. 7 - 1 = 5 6 = ? ? ? ? 6 11 47 11 37 30 1 5
• You are correct!
• Go on to the next question.
• You are correct!
• Go on to the next question.
• You are correct!
• Go on to the next question.
• You are correct! Congratulations!
• You have completed the last question!
THE END
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