Define addition.
The process of finding the total or sum by combining two or more numbers.
Define subtraction.
The process of finding the difference between two numbers by removing one from another.
What is the sum of 15 and 27?
The sum is 42.
What is the difference between 50 and 23?
The difference is 27.
Fill in the blank: 34 + ____ = 50.
16
Fill in the blank: 78 - ____ = 45.
33
True or false: Addition can only be performed on whole numbers.
FALSE
Addition can be performed on fractions and decimals as well.
True or false: Subtraction is the inverse operation of addition.
TRUE
What is regrouping in addition?
Regrouping is rearranging values to simplify addition, often involving carrying over.
What is borrowing in subtraction?
Borrowing is taking from the next higher place value to simplify subtraction.
What is the first step in adding multi-digit numbers?
Align the numbers by their place values.
What is the first step in subtracting multi-digit numbers?
Align the numbers by their place values.
Fill in the blank: 89 + 47 = ____.
136
Fill in the blank: 100 - 57 = ____.
43
What is mental math?
Performing calculations in your head without using paper or a calculator.
True or false: You can add fractions directly without a common denominator.
FALSE
Fractions must have a common denominator to be added.
What is the commutative property of addition?
The order of numbers does not change the sum (a + b = b + a).
What is the associative property of addition?
Changing the grouping of numbers does not change the sum ((a + b) + c = a + (b + c)).
Fill in the blank: 56 + 34 + ____ = 100.
10
What does it mean to estimate in addition?
To find an approximate sum rather than an exact total.
What does it mean to estimate in subtraction?
To find an approximate difference rather than an exact result.
Fill in the blank: The inverse of addition is ____.
Subtraction
Fill in the blank: The inverse of subtraction is ____.
Addition
What is a number line used for?
To visually represent addition and subtraction operations.
