Add Em' Up
12.3 + 3.7
16
39 - 19
20
Which property of addition allows you to switch the order in which you add two or more numbers?
The commutative property of addition
When you are adding/subtracting numbers, especially decimals, what do you have to do in order to get the correct answer?
Line up the decimals/place value.
This is what we call the result of adding two or more numbers together.
Sum
24 + 56
80
12.7 - 6.5
6.2
Which property of addition allows you to move the parentheses around different numbers during an addition problem?
The associative property.
Can you subtract with the smaller number on top and the greater number on the bottom?
No you cannot.
This is what we call the result of subtracting one number from another.
Difference
1.24 + 2.76
4
64 - 28
36
Can you use either the associative property or the commutative property during a subtraction problem?
No you cannot.
If you subtract a number from another, what can you do to check that your math was correct?
Add the difference back to the smaller number and see if they add up to the greater number.
This is what we call the result of multiplying two or more numbers together.
Product
16 + 37 + 24
77
1.25 - 0.99
0.26
Can you use the associative and commutative properties during a multiplication problem?
Yes, you can.
When you add or subtract numbers mentally using compensation, what do you have to do at the end of the problem to make sure the answer is correct?
You have to add/subtract the number back in at the end.
This is what we call the result of dividing one number by another.
Quotient
4.98 + 2.1 + 5.02
12.1
365 - 176
189
What are the opposite operations of addition/multiplication?
In rounding, when is the only time you would increase the numbers to the left of the rounding digit?
If the rounding digit was a 9.
Key word clue: If you see the phrase "split equally among" in the middle of a word problem, which mathematical operation are you likely going to have to do?
Division