Solving Three-Digit Change Problems: Find the Unknowns!

Lily has 245 marbles. She buys some more and now has 378 marbles. How many marbles did she buy?

• 150

• 120

• 200

• 133

Tom had 512 stickers. He gave away some to his friends and now has 289 stickers left. How many stickers did he give away?

• 200

• 250

• 223

• 300

A store had 675 toys. They sold some toys and now have 432 toys left. How many toys were sold?

• 150

• 243

• 500

• 300

Emma collected 389 seashells. She found some more and now has 456 seashells. How many seashells did she find?

• 50

• 100

• 75

• 67

A library had 823 books. They donated some books and now have 715 books left. How many books were donated?

• 150

• 108

• 120

• 95

Jack had 456 baseball cards. He traded some cards with his friend and now has 389 cards. How many cards did he trade?

• 100

• 67

• 78

• 45

Sophie had 712 crayons. She lost some and now has 645 crayons. How many crayons did she lose?

• 80

• 67

• 60

• 75

A farmer had 950 apples. He sold some apples and now has 812 apples left. How many apples did he sell?

• 138

• 150

• 100

• 200

Mia had 678 stickers. She received some more and now has 745 stickers. How many stickers did she receive?

• 67

• 50

• 100

• 80

A bakery had 540 cupcakes. They sold some and now have 432 cupcakes left. How many cupcakes were sold?

• 90

• 108

• 150

• 120