Adding doubles plus 1

Front

What is the result of adding 8 and 9?

Back

17

Front

What is the result of adding 1 and 2?

Back

3

Front

What is the result of adding 3 and 4?

Back

7

Front

What is the result of adding 5 and 6?

Back

11

Front

What is the result of adding 7 and 6?

Back

13

Front

What is the definition of addition in mathematics?

Back

Addition is the mathematical operation of combining two or more numbers to get a total.

Front

What is the commutative property of addition?

Back

The commutative property states that changing the order of the numbers being added does not change the sum (e.g., a + b = b + a).

Front

What is the associative property of addition?

Back

The associative property states that the way in which numbers are grouped when adding does not change the sum (e.g., (a + b) + c = a + (b + c)).

Front

What is the identity property of addition?

Back

The identity property states that adding zero to any number does not change the number (e.g., a + 0 = a).

Front

How do you add two-digit numbers?

Back

To add two-digit numbers, align the numbers by place value, add the digits in the ones place, carry over if necessary, and then add the digits in the tens place.