Missing Number Problems

Missing Number Problems

Fill in the Blanks

7 + - = 10

Solving mising number addition problems

• To find a missing addend, we have to subtract

• Example: to find 7 + _ = 10, we would flip the problem and subtract: 10 - 7 = ?

• Our answer is the missing number

Fill in the Blanks

+ 6 = 15

Fill in the Blanks

12 + _ = 25

Fill in the Blanks

_ + 30 = 50

Fill in the Blanks

67 + _ = 100

Subtraction: Missing Second Number

• The first number in a subtraction problem is called the subtrahend

• If it is missing, we subtract the difference to solve

• Example: 14 - _ = 6: to solve we subtract the difference 14 - 6 = ?

• The answer is our missing number

Fill in the Blanks

12 - _ = 4

Fill in the Blanks

25 - _ = 16

Fill in the Blanks

35 - _ = 23

Fill in the Blanks

100 - _ = 43

Subtraction: Missing First Number

• The second number in a subtraction problem is called the minuend

• To solve, we must add

• Example: _ - 6 = 3: to solve we add: 6+3 = ?

• The answer is our missing number

Fill in the Blanks

_ - 4 = 6

Fill in the Blanks

_ - 12 = 16

Fill in the Blanks

_ - 23 = 51

Fill in the Blanks

_ - 100 = 200

Fill in the Blanks

_ - 345 = 567