Adding
(-10) + 17 =
7
387-258 =
129
(-7) x 4 =
-28
(-24) ÷ 8 =
-3
multiplying positive and negative number rules
+ * + = - ; multiply same signs = positive
- * - = + ; multiply same signs = positive
+ * - = - ; multiply opposite signs = negative
- * + = - ; multiply opposite signs = negative
(-32.5) + (-25.37) =
-57.87
25 - (-15) =
40
(-6) x (-9) =
54
(-42) ÷ (-6) =
7
Dividing positive and negative number rules
+ * + = - ; divide same signs = positive
- * - = + ; divide same signs = positive
+ * - = - ; divide opposite signs = negative
- * + = - ; divide opposite signs = negative
(-102)+ 53.9 =
-48.1
1.2
(-3.5) x (-0.7) =
2.45
(-25.5) ÷ (-5) =
5.1
Add two positive or two negative numbers rule
Add as "normal" and carry the same sign to your answer.
(-3/5) + (-2/15) =
-11/15
(-42.87) - 13.19 =
-56.06
25.4 x (-18) =
-457.2
(-3/4) ÷ (-8/9) =
27/32
Add one negative and one postive number rule
Subtract the absolute value, then choose the sign with the biggest absolute value.
(-17/20) + 1/4 =
(-1/4) - 7/8 =
-9/8 or -1 1/8
(-3/9) x (-5/6) =
15/54 or 5/18
2/7 ÷ 3 1/4 =
8/91
Subtracting positive and negative numbers rule
Use KCC to turn the subtraction problem into an addition problem then solve using the appropriate adding rule.