Alex had 32 books on his bookshelf. After buying some more books, his collection grew to 67 books. What is the best estimate of the number of books Alex purchased?

• 50

• 20

• 40

• 30

Maria had 189. Complete the model to find how much money Maria received for her birthday.

Move the correct answer to each box. All answers will be used.

(a)   +​ (b)   =​ ​ (c)  

• 56
• ?
• 189

There were 94 cookies in the jar.

After some cookies had been eaten, there were 47 cookies left.

What equation could NOT be used to find the number of cookies eaten?

• 94 - ___ = 47

• 94 - 47 = ___

• 47 + ___ = 94

• 94 + 47 = ___

Ms. William's classroom had 175 pencils at the beginning of the school year.

After receiving more supplies, there are now 236 pencils.

How many pencils were given to Ms. William's classroom?

Choose the correct answer from the drop-down menu to complete the statement.

There were ​ (a)   pencils given to Ms. Williams's classroom.

• 411

• 61
• 301

• 141

A farmer had 310 apples at the market. After selling some, there are now 278 apples left. How many apples did the farmer sell?

Mathematical Equivalence

ON