Estimating with Number Lines: Fun Math Challenges for 3rd Grade

1. Sarah has 10 apples. She gives 3 apples to her friend. Use a number line to show how many apples Sarah has left.

• 5 apples

• 7 apples

• 10 apples

• 3 apples

Tags

CCSS.7.NS.A.1C

2. A train leaves the station at 5:00 PM and travels for 2 hours. Use a number line to estimate what time the train arrives at its destination.

• 8:00 PM

• 5:30 PM

• 6:00 PM

• 7:00 PM

Tags

CCSS.5.G.A.2

3. Tom has 15 marbles. He loses 4 marbles while playing. Use a number line to find out how many marbles Tom has now.

• 11

• 12

• 10

• 9

Tags

CCSS.2.MD.B.6

CCSS.1.NBT.C.4

4. There are 20 students in a class. If 5 students go home early, use a number line to determine how many students are still in class.

• 15

• 10

• 20

• 5

Tags

CCSS.2.OA.A.1

5. Lisa read 12 pages of her book on Monday and 8 pages on Tuesday. Use a number line to estimate how many pages she read in total.

• 18 pages

• 20 pages

• 25 pages

• 15 pages

Tags

CCSS.7.NS.A.1C

6. A baker made 30 cookies. If he sells 10 cookies, use a number line to find out how many cookies he has left.

• 20

• 25

• 15

• 10

Tags

CCSS.2.OA.A.1

7. Jenny has 25 stickers. She gives 7 stickers to her friend. Use a number line to show how many stickers Jenny has now.

• 20

• 15

• 10

• 18

Tags

CCSS.2.MD.B.6

CCSS.1.NBT.C.4

8. A gardener planted 40 flowers. If 15 flowers die, use a number line to estimate how many flowers are still alive.

• 20

• 25

• 30

• 35

9. Mark has 50 toy cars. He donates 20 cars to charity. Use a number line to find out how many toy cars Mark has left.

• 25

• 40

• 30

• 15

Tags

CCSS.2.NBT.B.7

10. A library has 100 books. If 30 books are checked out, use a number line to determine how many books are still in the library.

• 50

• 60

• 80

• 70

Tags

CCSS.2.NBT.B.7