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# 3.3 Subtracting Integers (Day 1) (1 R) (2009)

## by Michael Doroquez on Nov 04, 2009

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## 3.3 Subtracting Integers (Day 1) (1 R) (2009)Presentation Transcript

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• DO NOW
• LAST NIGHT’S HW
• Back to Clock Home 01 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Classroom Timer 00 2 Minutes
• Back to Clock Home 00 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Classroom Timer 00 1 Minute
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• When the number is positive TED the Turtle moves forward
• When the number is negative TED the Turtle moves backward
• When subtracting, TED changes direction
• 3 + -5 = -2 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• 6 + -4 = 2 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• 3 + -7 = -4 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• -3 + 8 = 5 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• 3 - 5 = -2 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• 6 - 4 = 2 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• 3 - 7 = -4 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• -3 – (-8) = 5 0 1 2 3 4 5 6 -1 -2 -3 -4 -5 -6
• Subtraction 3 – 3 = 3 – 2 = 3 – 1 = 3 – 0 = 3 – -1 = 3 – -2 = 3 – -3 = Addition 3 + -3 = 3 + -2 = 3 + -1 = 3 + 0 = 3 + 1 = 3 + 2 = 3 + 3 =
• Change the minus sign to addition
• Change the second number into the opposite
• Do the problem like a regular addition problem
5 – 7 -3 – 6 3 – (-7) -5 – (-9)
• Worksheet
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