Add Subtract Missing Addends

You _______ when you join together sets to find the total or sum.

• related facts

• fact family

• add

• subtract

The missing number in a number sentence is called the ______.

• related fact

• missing addend

• sum

• near doubles

Addition and subtraction facts that use the same three numbers are called a _______.

• difference

• sum

• near double

• fact family

Use mental math to solve.

120 + 42 + 80

Juan has 253 marbles. Ella has 38 more marbles than Juan. How many marbles does Ella have? Ella has (a)   marbles.

679

+56

• 61215

• 635

• 4635

• 345

• 735

Solve:
246 + 553 = ?

• 313

• 799

• 809

• 307

James have 90 marshmallows in the jar. He adds 382 more. How many marshmallows are now in the jar? 

• 472

• 289

• 340

• 198

Find the Missing Addend 12 + ___ = 19

• 7

• 31

• 5

• 21

Find the Missing Addend 5 + ___ = 16

• 11

• 12

• 10

• 13