Created by Mr. Lafferty Maths Dept.

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Presentation transcript:

Created by Mr. Lafferty Maths Dept. Integers Add / Subtract Integers Double Negatives www.mathsrevision.com Multiply +ve / -ve Integers Divide by +ve or -ve Integers 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Addition & Subtraction Learning Intention Success Criteria 1. To understand how to add positive and negative numbers using the thermometer as an aid. To be able to do add and subtract both positive and negative integers. www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers 4 3 2 1 -1 -2 -3 Addition & Subtraction 1 + 3 = 4 Think Thermometer 4 - 5 = -1 www.mathsrevision.com -3 + 5 = 2 -1 - 2 = -3 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Now try Exercise 3 Ch2 (page 14) www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Addition & Subtraction Learning Intention Success Criteria 1. To explain the ‘double negative’ for integers. To understand the ‘double negative’ for integers. 2. To simplify and solve problems using the ‘double negative’ property. www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Addition & Subtraction Rule - - = + When side by side “Two negatives make a positive” Double Negative 1 - (- 2) = 1 + 2 = 3 - 4 – (- 5) = - 4 + 5 = 1 www.mathsrevision.com -3 - (- 5) = - 3 + 5 = 2 -1 - (- 10) = -1 + 10 = 9 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Addition & Subtraction Now try Exercise 4 Ch2 (page 15) www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Multiplication & Division Learning Intention Success Criteria 1. Understand how to multiply positive and negative integers. 1. Explain how to multiply positive and negative integers. www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Integers Rule +ve x -ve = -ve +ve ÷ -ve = -ve Multiplying Integers Multiplication & Division Rule +ve x -ve = -ve +ve ÷ -ve = -ve Multiplying / Dividing “A positive x a negative gives a negative answer” “A positive ÷ a negative Multiplying Integers 1 x (-2) = (-2) (-2) ÷ 1 = -2 (-4) x 5 = -20 (- 20) ÷ 5 = -4 www.mathsrevision.com (-3) x 3 = -9 15 ÷ (-5) =-3 5 x (-8) = -40 40 ÷ (-8) = -5 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Multiplication & Division Now try Exercise 5 Ch2 (page 17) Q1 – Q6 www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Multiplication & Division Learning Intention Success Criteria 1. Understand the ‘double negative’ for multiplying and dividing negative numbers. 1. To explain the double negative for multiplying and division. www.mathsrevision.com 2. Use double negative to solve problems. 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Integers Rule -ve x -ve = +ve -ve ÷ -ve = +ve Multiplying / Dividing Multiplication & Division Rule -ve x -ve = +ve -ve ÷ -ve = +ve Multiplying / Dividing “A negative x a negative gives a positive answer” “A negative ÷ a negative (-2) x (-1) = 2 (-2) ÷ (-1) = 2 (-4) x (-5) = 20 (- 20) ÷(-5) = 4 www.mathsrevision.com (-3) x (-3) = 9 (-9) ÷ (-3) =3 (-5) x (-8) = 40 (-40) ÷ (-8) =5 18-Apr-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Integers Multiplication & Division Now try Exercise 5 Ch2 (page 18) Q7 – Q10 www.mathsrevision.com 18-Apr-19 Created by Mr. Lafferty Maths Dept.