3rd Grade

 

Bancroft School

Math Bug Dragonfly

   

Name: Teacher:

1

Draw the hands on the clock faces to show the correct times.

1) 4:00

2) 12:38

3) 8:10

4) 1:52

5) 9:45

6) 7:00

7) 9:50

8) 8:15

9) 10:30

Two expert runners ran at exactly the same speed. One day, they decided to run around a lake together. One runner covered the distance in 1 hour, 20 minutes. The other runner, however, finished in only 80 minutes. If they did indeed run at the same speed, how is this possible?

2

80 50 45 75 + 23 + 32 + 30 + 72

82 40 60 81 + 7 + 25 + 96 + 46

76 67 + 19 + 54

Why are 1980 pennies worth almost $20? Because

It’s HOW big???

3

70 11 - 40 - 10

11 74 40 28 - 11 - 40 - 34 - 17

73 48 91 44

- 53 - 32 - 77 - 12

Take five pennies from 100 pennies and what do you have?

4

Write each number in standard form.

1)  Thirty-two thousand, three hundred fifty

2)   Five thousand, three hundred ninety-five

3)  One thousand, nine hundred sixty-five

4)  Ten thousand, one hundred ninety-nine

5)  One hundred eight thousand, one hundred twenty-two

Write the place value for the underlined digit.

1)  3196

2)  1386

3)  2887

4)  9532

5)  6683

6)  2081

7)  9094

8)  10988

9)  42122

5

Count the coins and write the amount. Amount($)

6

Use the smallest amount of coins to show the following amounts: 1¢ 5¢ 10¢ 25¢

Amount: Coins  I  should  use:

1) $0.49

2) $0.87

3) $0.29

4) $0.09

5) $0.51

Find the correct change:

Amount  of  money: Amount  of  money  spent: Change:

$2.20 $ ____ . ____

$0.80 $ ____ . ____

$0.21 $ ____ . ____

$5.00 $ ____ . ____

$8.99 $ ____ . ____

Q: Where does a snowman keep his money? A: In a snowbank.

N P Q D

7

1. 415 + 500

2. 929 + 840

3. 550 + 302

4. 253 + 802

5. 526 + 112

6. 144 + 800

7. 888 + 100

8. 598 + 900

9. 767 + 832

10. 6067 + 732

11. 6324 + 182

12. 8268 + 110

Q: What months have 28 days? A: All of them!

Q: How do you make seven even? A: Remove the “S”!

8

1. 557 - 546

2. 657 - 156

3. 666 - 133

4. 839 - 428

5. 800 - 600

6. 475 - 400

7. 406 - 300

8. 708 - 602

9. 929 - 648

How many squares do you see?

9

Draw each rectangle on the grid.

1)   1) Draw a 3-by-5 rectangle.

Area = _______ square units

2)   2) Draw a 6-by-8 rectangle.

Area = _______ square units

3)   3) Draw a 9-by-5 rectangle.

Area = _______ square units

4)   4) Draw a 4-by-7 rectangle.

Area = _______ square units

Quick! How much dirt is in a rectangular hole that is 3 feet wide, 4 feet long, and one foot deep?

10

Shade boxes to match the fractions:

1) Color 1/2 blue.

2) Color 3/4 red.

3) Color 3/6 yellow.

4) Color 1/5 green.

Two mothers and two daughters went to the store, and each bought a brand-new bicycle. Yet only three bicycles were sold to them. How can that be?

11

1)  Round to the nearest thousand:

a)   14,389 ___________

b)  8,610 ___________

c)   3,492 ___________

2)  Round to the nearest ten thousand:

a)   24,987 ___________

b)  37,096 ___________

c)   45,302 ___________

3)  Round to the nearest ten:

a)   89 ___________

b)  2,673 ___________

c)   514 ___________

4)  Round to the nearest hundred:

a)   847 ___________

b)  5,496 ___________

c)   5,148 ___________

5)  Round to the nearest hundred thousand:

a)   829,689 ___________

b)  103,232 ___________

c)   449,987 ___________

Q: What is the difference between an old quarter and a new penny?

A: 24 cents!

12

1. 8 x 9

2. 7 x 6

3. 1 x 3

4. 3 x 9

5. 1 x 4

6. 0 x 5

7. 4 x 7

8. 4 x 5

9. 7 x 8

10. 0 x 4

11. 6 x 4

12. 2 x 3

Think of a number between 1 and 10. Then multiply it by 9. Add the

digits of your answer. Subtract 5. The answer is always: .

Do you know why?

13

The opposite of multiplying is dividing! You can use your times tables to look up answers to these division problems. Here’s an example. I have 12 jellybeans and I want to share them with my sister. (Or, mom told me to share them with my sister. Rats.) How many jellybeans will each of us get?

Well, 12 jellybeans, divided into 2 equal shares, is 6 jellybeans. See?

=

For my sister and for me!

1) 4 8

2) 9 18

3) 2 6

4) 9 18

5) 6 36

6) 9 27

7) 5 30

8) 8 56

9) 7 21

14

Write the equation and solve each problem. 1)   Jimmy woke up every school day at 7:00 A.M. It took him fifteen minutes to dress,

fifteen minutes to eat breakfast, and thirty minutes to complete his morning chores. After Jimmy did his chores, he left for school. What time did he leave for school?

2)   Joseph and Noah went fishing on Saturday. They caught three large fish and five

small fish. How many fish did they catch all together? 3)   Sarah and Patricia wanted to give their teacher a bouquet of flowers. They each

picked six beautiful, fragrant flowers. How many flowers were in the bouquet? 4)   Eva read 15 books in four weeks. The first week she read four books. The second

week she read 5 books. The third week she read two books. How many books did Eva have left to read?

Can you tell which number should replace the question mark to continue the series below?

Answer:

1 8 7 1

9

2 2 1

5

1 6 2

9

2 5 4

?

15

1)   Rosa, Glen, Cathy, and Errol each bought snacks from several vending machines. Each person got back 6 coins, but they were different combinations of coins.

Each person received less than $1 in change. The machines returned only nickels, dimes, and quarters. Each person had at least one of each coin.

•   Rosa had the fewest dimes but the same number of quarters as Errol. •   Glen had an equal number of nickels, dimes, and quarters. •   Cathy had the same number of quarters as Glen. •   Errol had more dimes than Cathy. •   Cathy had more dimes than quarters. •   Rosa had fewer quarters than Cathy.

How much money did each person get back from the machines?

How much money did they get back in all?

2)   During school vacation, Lyle cared for his neighbors' pets while the neighbors were away. He got paid for each visit to each house. Lyle made 28 trips in all. He had to keep track of the number of times he went to each house.

•   Lyle fed and played with the McGraths' cat, Snowball, twice a day for three days. •   He walked the Dunns' dog, Fido, twice a day, for three days. •   Chow, the Carbones' puppy, needed a lot of attention. So Lyle went to the

Carbones' house three times a day for four days. •   Lyle visited the Quinns' hamster, Squeaky, once a day for four days.

How many trips did he make to each house?

Yay! You’ve finished the Math Bug! Thank you for playing!

Answers to the brainteasers may be found on the next page.

16

Brainteaser Answers:

Page 1: 1 hour, 20 minutes is the same as 80 minutes. J Page 2: 1980 pennies = $19.80, which is close to $20! Page 3: You have five pennies!

Page 8: 16 squares in all. Page 9: There’s no dirt in a hole! It’s empty! J Page 10: One of the daughters was also a mother. A grandmother, mother, and daughter all went to the store together. Page 12: The answer is always 4, because once you multiply your number by 9, if you

add the digits, they will always add up to 9. And 9 minus 5 is always 4!

Page 14: 11. (The sequence is: Top plus left plus right.)