About Subtracting Integers:
When we subtract integers, we change the subtraction problem to addition of the opposite. For example: -5 - 7 = -5 + (-7) = -12. We always keep the first number the same, change the subtraction to addition, and change the sign of what’s being subtracted away.
Test Objectives
- Demonstrate the ability to change a subtraction problem to addition of the opposite
- Demonstrate the ability to perform a subtraction with two integers
- Demonstrate the ability to perform a subtraction with more than two integers
#1:
Instructions: Perform each subtraction.
a) 6 - 8
b) 11 - 17
c) -15 - 9
d) -12 - 22
e) -14 - 115
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#2:
Instructions: Perform each subtraction.
a) -7 - 8
b) -4 - (-2)
c) -1 - 99
d) -70 - (-12)
e) -18 - (-13)
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#3:
Instructions: Perform each subtraction.
a) 3 - 8 - 6 - 17
b) 5 - 3 - 7 - 11
c) -7 - (-9) - 4 - 9
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#4:
Instructions: Perform each subtraction.
a) -15 - (-25) - 17 - (-8) - 4
b) -27 - (-103) - 81 - 54 - (-13)
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#5:
Instructions: Perform each subtraction.
a) -90 - 27 - (-7) - 14 - (-28) - 11
b) -45 - 300 - (-4) - (-2) - 39 - (-73)
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Written Solutions:
#1:
Solutions:
a) 6 - 8 = -2
b) 11 - 17 = -6
c) -15 - 9 = -24
d) -12 - 22 = -34
e) -14 - 115 = -129
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#2:
Solutions:
a) -7 - 8 = -15
b) -4 - (-2) = -2
c) -1 - 99 = -100
d) -70 - (-12) = -58
e) -18 - (-13) = -5
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#3:
Solutions:
a) 3 - 8 - 6 - 17 = -28
b) 5 - 3 - 7 - 11 = -16
c) -7 - (-9) - 4 - 9 = -11
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#4:
Solutions:
a) -15 - (-25) - 17 - (-8) - 4 = -3
b) -27 - (-103) - 81 - 54 - (-13) = -46
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#5:
Solutions:
a) -90 - 27 - (-7) - 14 - (-28) - 11 = -107
b) -45 - 300 - (-4) - (-2) - 39 - (-73) = -305
