Solving Word Problems with the
Change Unknown
Standard 1.OA.1 Use addition and subtraction to solve
word problems within 20.
1.OA.4 Understand subtraction as an unknown addend
problem.
1.OA.7 Understand the meaning of the equal sign
Bria picked 10 flowers.
She gave some to her mom.
Now she has 4 flowers.
How many flowers did she give her
mom?
________________
________ flowers
Chase had 5 cars.
He got some more at the store.
Now Chase has 13 cars.
How many did Chase get at the store?
_______________
_______ cars
Jamie had 12 video games.
He gave some to his friend.
Now he has 5 video games.
How many video games did Jamie
give to his friend?
_______________
________ video games
Sam had 7 fish in his fish tank.
Then he got some more at the
pet store.
Now he has 15 fish.
How many fish did Sam get at the pet
store?
________________
_______ fish
Amy had 3 shells.
She found some more.
Now Amy has 12 shells.
How many shells did Amy find?
_______________
________ shells
Mike had 16 baseball cards.
He gave some away.
Now he has 8 cards.
How many baseball cards did Mike give away?
____________________
___________ baseball cards
Kasey has 6 fish in her bucket.
Then she caught some more.
Now she has 16 fish.
How many fish did Kasey catch?
___________________
___________ fish
Tyrell had 17 crayons.
He lost some of his crayons.
Now he has 8 left.
How many crayons did Tyrell lose?
___________________
____________ crayons
There were 10 cookies on a plate.
Erica ate some of them.
Now there are 4 cookies left.
How many cookies did Erica eat?
____________________
__________ cookies
Emily had 15 dolls.
Some of the dolls have red hair.
Eleven dolls have black hair.
How many dolls have red hair?
__________________
___________ dolls