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Why do you check addition with subtraction?
to ensure and re-check your work you use the opposite signs (addition & subtractions, multiplication & division) e.g. __= blank 10+ _ = 12 _=2 to check: you take the answer (in this case 12) and subtract (because its the opposite of addition) by the blank you filled in (2 in this case. therefore, 12-2=10 so we know its correct :-)
What is a math mountain?
a math mountain is a ^ but bigger and on the left and right sides in the outside middle there are subtraction signs and on the bottom there is an addition sign in the middle and on the top point is the largest number and on the bottom two points there are the other two numbers
Adding integers with different signs?
If you're adding a positive amount, keep the + sign; if you're adding a negative amount, multiply the + and - signs to convert it into a subtraction. Example: 4 + (-5) = 4 (+*-) 5 = 4 - 5 = -1
What does -3 -2x4 equals?
The rule in /mathemtics, when no brackets are given, is DO THE MULTIPLCATUION/DIVISION before addition /subtraction. You calculator is programmed this way. Hence -3 -2 X 4 = -3 - 8 = -11 Notice I have made the mukltiplication be forde the subtraction. However, if the sum is wrtitten as (-3-2)x 4 , then you do the brackets first . ( -5) x 4 = -20 It is definitely NOT -6 x 4
Do two plus signs make a minus?
In addition and subtraction, if the plus sign is larger than the minus sign, then it's a plus. For example: +10 minus -20 = -10 If the plus sign is smaller than the minus sign, the answer will be a minus. For example: -10 minus + 20 = -10 In multiplication, if you have 2 plus signs, the answer will be a plus sign. If you have 2 minus signs, the answer will be a plus sign then, too. But if you have a plus and a minus sign, then the answer will be a minus. For example: +5 x + 2 = +10 -5 x - 2 = +10 -5 x +2 = -10
