Does a positive plus a negative equal a positive?
What does a negative and a positive make? The signs add together physically. If you have a positive and a negative, there is one dash left over, and the answer is negative.
Why do 2 negatives make a positive?
Rule 3: A negative number times a negative number, equals a positive number. Two negatives make a positive, so a negative number times a negative number makes a positive number. If you look at it on the number line, walking backwards while facing in the negative direction, you move in the positive direction. For example. -2 x -4 are both negative, so we know the answer is going …
What does and positive and a negative make?
is really saying. "Positive 6 plus Negative 3 equals Positive 3". We could write it as (+6) + (−3) = (+3) The last two examples showed us that taking away balloons (subtracting a positive) or adding weights (adding a negative) both make the basket go down. So …
What is a positive minus a negative?
Remember that two plus signs or two minus signs make a positive. One plus and one minus make a negative.
What does a negative and a positive make?
What happens when you add a positive and negative number?
Do 2 negatives make a positive?
What are the rules when adding and subtracting positive and negative numbers?
If you're adding positive and negative numbers together, subtract the smaller number from the larger one and use the sign from the larger number.
Rule 1: A positive number times a positive number equals a positive number
This is the multiplication you have been doing all along, positive numbers times positive numbers equal positive numbers.
Rule 2: A negative number times a positive number equals a negative number
When you multiply a negative number to a positive number, your answer is a negative number. It doesn’t matter which order the positive and negative numbers are in that you are multiplying, the answer is always a negative number.
Rule 3: A negative number times a negative number, equals a positive number
Two negatives make a positive, so a negative number times a negative number makes a positive number. If you look at it on the number line, walking backwards while facing in the negative direction, you move in the positive direction.
No Sign Means Positive
If a number has no sign it usually means that it is a positive number.
Play with it!
First, try the sliders below and see what happens when numbers go negative:
Balloons and Weights
Let us think about numbers as balloons (positive) and weights (negative):
Adding A Negative Number
Now let's see what adding and subtracting negative numbers looks like:
Now Play With It!
Try playing Casey Runner, you need to know the rules of positive and negative to succeed!
Rule 1: A positive number divided by a positive number equals a positive number
This is the division you have been doing all along. For example: 16 / 4 = 4. We don’t place + in front of the numbers. It’s assumed no sign in front of the number means positive.
Rule 2: A positive number divided by a negative number equals a negative number
When you divide a negative number by a positive number, your answer is a negative number. As with multiplication, it doesn’t matter which order the positive and negative numbers are in, the answer is always a negative number.
Rule 3: a negative number divided by a negative number equals a positive number
Two negatives make a positive, so a negative number divided by a negative number equals a positive number.
1.5 Why is NEGATIVE TIMES NEGATIVE POSITIVE?
When we discover negative numbers we naturally, without question even, assume they obey the same laws of arithmetic as the ordinary positive counting numbers.
MULTIPLYING POSITIVE AND NEGATIVE NUMBERS
In the early curriculum multiplication is introduced in the context of whole counting numbers and is appropriately defined there as repeated addition. For instance, 4 × 5 is read as “four groups of five” and is computed as such: 4 × 5 = 5 + 5 + 5 + 5 = 20.
THINKING OUR WAY THROUGH THINGS
Positive times Negative : It does seem compelling to hold on to the “repeated addition” notion for the product of a negative and a positive:
THE PRECISE LOGICAL ARGUMENT AS TO WHY NEGATIVE TIMES NEGATIVE SHOULD BE POSITIVE
Once we agree that 2 × ( − 3) = − 6 (via repeated addition) and ( − 3) × 2 = − 6 (via a belief in commutativity), that negative times negative is positive is a forced logical consequence of these next two basic beliefs of arithmetic: a × 0 = 0 and a ( b + c) = a b + a c . Here’s why:
