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Flashcards by Kathyann Noel, updated more than 1 year ago
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| Question | Answer |
| same negative sign | negative -3 + -8= -11 |
| same positive sign | positive 3 + 8 =11 |
| different sign | First subtract the smaller from the larger. Then take the sign of the larger number. -8 + 3= -5 |
| -4 + -9= ? | -4 + -9= -12 |
| 4 + -9= ? | 4 + -9= -5 |
| 7+6=? | 7+6=13 |
| -1 + -3=? | -1 + -3=-4 |
| 16 + (- 64)=? | 16 + (- 64) = - 48 Solution: To add two numbers with opposite sign, first subtract the smaller absolute value from the larger one and attach the sign of the larger absolute value. 16 + (- 64) = - ( | - 64 | - | 16 | ) = - (64 - 16) [Find the absolute value of the numbers.] = - 48 |
| - 52 + (- 19)=? | - 52 + (- 19)=71 Solution: To add two numbers with same sign, first add their absolute values and attach the common sign. - 52 + (- 19) = - (| - 52 | + | - 19 |) = - (52 + 19) [Find absolute value of the numbers.] = - 71 |
| (- 8 + 6) + 13=? | (- 8 + 6) + 13=11 Solution: (- 8 + 6) + 13 = - 8 + (6 + 13) [Use associative property.] = - 8 + 19= 11 [Subtract their absolute values and attach the sign of the number with larger absolute value.] |
| 8 + (- 5/6) + (- 1/6) =7 Solution: 8 + (- 56) + (- 16) = 8 + [(- 56) + (- 16)] [Use associative property.] = 8 + (- 1) [Add - 5 / 6 and - 1 / 6.] = 7 [Add 8 and - 1.] | |
| Solution: (- 2 / 5) + (- 3 / 5) + 2 / 5 [Original Expression.] = - 2 / 5 + 2 / 5 - 3 / 5 [Use commutative property.] = (- 2 / 5 + 2 / 5) + (- 3 / 5) [Use associative property.] = 0 + (- 3 / 5) [Use inverse property.] = - 3 / 5 [Use identity property.] |
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