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Equations with unknown value
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Equation Detectives
100

Kaila has 4 pencils. Noel has 7 pencils.

Which equation represents how many more pencils Noel has than Kaila?

A. 4+7=11

B. 7-4=3

C. 7+4=11

D. 7-3=5

B. 7-4=3

100

Some frogs were sitting on a log. Five more frogs hopped onto the log. Then there were 9 frogs.

Which equation represents how many frogs were on the log before?

A. 9+5=?

B. ?+5=9

C. ?-9=5

D. 5-?=9

B. ?+5=9

100

Amy has 8 stickers. Her friend gives her 6 more stickers.

How many stickers does Amy have altogether?

A. 2

B. 14

C. 48

D. 86

B. 14

100

Jenny has 15 building blocks. She gives 6 blocks to her friend.

How many blocks does Jenny have left?

A. 9

B. 21

C. 6

D. 15

A. 9

100

There are 15 students in the art room. Some students are painting, and 6 students are drawing. All 15 students are either painting or drawing.

Which equation can be used to find how many students are painting?

A. 15+6=?

B. 15-6=?

C. 6-15=?

D. 15+?=6

B. 15-6=?

200

Emma has 12 squishies. Emma has 5 more squishies than Mia.

Which number sentence can be used to find how many squishies Mia has?

A. 12+5=17

B. 12-5=7

C. 5-12=7

D. 12+7=19

B. 12-5=7

200

Some treats were on a table. Sampson ate 9 treats. Then there were 2 treats. How many treats were on the table before?

Which equation represents the problem?

A. 2 + ? = 9

B. 9 - 2 = ? 

C. ? - 2 = 9

D. ? - 9 = 2   

D. ? - 9 = 2  

200

Tony has 8 baseball cards and 14 superhero cards.

Which number sentence shows how many cards Tony has in all?

A. 14-8=6

B. 14+8=22

C. 14-8=22

D. 14+8=6

B. 14+8=22

200

Kaiden read 30 pages in his book yesterday. He read 17 pages before dinner and the rest of the pages after dinner. How many pages did Kaiden read after dinner?

13

200

There are 14 students in the art club and 9 students in the music club. The teacher wants to know how many more students are in the art club.

Which equation should the teacher use?

A. 14+9=?

B. 14-9=?

C. 9-14=?

D. 14+?=9

B. 14-9=?

300

Jayden has 18 toy cars. Lucas has 11 toy cars.

How many fewer toy cars does Lucas have than Jayden?

A. 7

B. 11

C. 18

D. 29

A. 7

300

There are some students riding on a school bus. At the first stop, 8 students get off the bus. After they left, there were 5 students left on the bus. Which equation represents how many students were on the bus at the beginning? 

A. ? - 8 = 5

B. 13 + ?= 8 .

C. 13 + 5 = ?

D. 8 + 5 = 13

D. 8 + 5 = 13

300

There are 17 students on the playground. Another 15 students come outside.

How many students are on the playground now?

A. 2

B. 22

C. 32

D. 42

C. 32

300

There were 13 marbles in a bag. 7 are red, and the rest are blue. How many marbles are blue?

A. 7

B. 11

C. 6                                 

D. 20  

C. 6

300

There were some books on a shelf. A librarian put 16 more books on the shelf. Now there are 38 books.

Which equation represents the number of books that were on the shelf at first?

A. 38+16=?

B. ?-16=38

C. ?+16=38

D. 16-?=38

C. ?+16=38

400

Ava has 9 friendship bracelets. Olivia has 6 more bracelets than Ava.

Which equation can be used to find how many bracelets Olivia has?

A. 9-6=3

B. 9+6=15

C. 15-9=6

D. 9+15=24

B. 9+6=15

400

Some squishies were in a prize box. A teacher added 18 more squishies. Now there are 42 squishies in the box.

Which equation can be used to find how many squishies were in the box before?

A. 42+18=?

B. ?+18=42

C. 42-18=42

D. 18-?=42

B. ?+18=42

400

A classroom has 28 crayons in one box and 16 crayons in another box.

Which equation represents the total number of crayons?

A. 28-16=12

B. 16-28=12

C. 28+12=40

D. 28+16=44

D. 28+16=44

400

A school parking lot has 32 spaces. Fourteen spaces are filled with cars.

How many spaces are empty?

A. 18

B. 46

C. 14

D. 22

A. 18

400

There were some birds sitting on a branch. 8 more birds flew onto the branch. Then there were 12 birds on the branch. Which equation represents how many birds were on the branch before?

A. 12 + 8 = ?

B. ? - 12 = 8 

C. ? + 8 = 12                                  .

D. 8 - ? = 12   

C. ? + 8 = 12

500

Noah has 24 Pokémon cards. Liam has 8 fewer cards than Noah.

Which number sentence can be used to find how many cards Liam has?

  • A. 24+8=32

  • B. 24-8=16

  • C. 8-24=16

  • D. 24+16=40

B. 24-8=16

500

Olivia has 14 pieces of candy. Olivia has 4 more pieces of candy than Harper has.

Write the number sentence that can be used to find the number of pieces of candy Harper has.

14 - 4 = 10

500

A toy store has 36 mini squishies and 27 animal squishies.

How many squishies does the store have altogether?

A. 53

B. 9

C. 63

D. 73

C. 63

500

A classroom has 24 pencils. Students use 12 pencils during an activity.

How many pencils are left?

A. 13

B. 36

C. 26

D. 12

D. 12

500

Raquel has 3 pencils. Halo has 6 pencils. Which equation represents how many more pencils Halo has than Raquel?

A. 3 + ? = 6

B. 6 + 3 = ? 

C. ? + 6 = 3

D. 6 + ? = 3    

A. 3 + ? = 6