Addition within 20

What is a missing addend problem?

• A problem where one of the numbers in an addition equation is unknown and needs to be found.

• A problem that involves subtracting one number from another.

• A problem that requires finding the product of two numbers.

• A problem that deals with the division of fractions.

How can estimation be used in addition?

• Estimation can be used to quickly find an approximate sum by rounding numbers to the nearest ten or five.

• Estimation is used to find the exact sum of numbers without rounding.

• Estimation helps in determining the maximum possible sum of numbers.

• Estimation is only useful for subtraction, not addition.

What is the importance of understanding place value in addition?

• It helps in aligning numbers correctly when adding multi-digit numbers.

• It allows for faster mental calculations without writing.

• It is only important for subtraction, not addition.

• It helps in memorizing multiplication tables.

What is the sum of 10 and 9?

• 17

• 18

• 19

• 20

What is the associative property of addition?

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

• The associative property states that the order of numbers in addition does not change the sum (e.g., a + b = b + a).

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

• The associative property states that the sum of two numbers is always greater than either number.

What is the sum of 9 and 7?

• 14

• 15

• 16

• 17

How can you use objects to demonstrate addition?

• You can use physical objects like blocks or counters to visually represent the addition of two groups.

• You can write numbers on paper and add them together without any objects.

• You can use a calculator to find the sum of two groups of objects.

• You can draw pictures of the objects instead of using real ones.

What is the sum of 6 and 9?

• 12

• 14

• 15

• 18

What is a number line and how is it used in addition?

• A number line is a visual representation of numbers on a straight line, used to illustrate addition by showing the movement from one number to another.

• A number line is a tool used for measuring distances in geometry.

• A number line is a type of graph used to plot points in a coordinate system.

• A number line is a method for solving equations in algebra.

What is the sum of 12 and 6?

• 16

• 18

• 20

• 14