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Topic Brain Teasers[1] (Lesson 29)

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T__O_B_PrI_aC_inN__AT_eM_aE_se_r_s_[_1_] _(_L_e_ss_o_n__2_9_)_________________________

Primary 5: Rev Up! Math

Brain Teasers

Solve the following puzzles and problems.Have fun!

1. Roly Poly

The dots on the opposite faces of a die add up to 8.

Imagine rolling one die.

The score is the total number of dots that you can see.

You score 17.

Which number is faced down?

How did you get your answer?

Imagine rolling two dice.

The dice do not touch each other.

The score is the total number of

dots you can see. You score 32.

Which numbers are faced down?

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Primary 5: Rev Up! Math

2. Bear with Us! How can the bears form a by only

The “numbered” bears are arranged in moving 3 bears? Draw your answer

the order you see below. Notice how

the bears are arranged to form a . using the numbers in the box provided

1 below.

23

456 My Answer:

7 8 9 10

2. What a Match!

Some matchsticks have been arranged to make 3 squares.

Move only 4 matchsticks to make 3 squares. Draw your answers in the box.

Try this !! Move 3 matches to form 4 squares. 2

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Primary 5: Rev Up! Math

3. How Do I Cross the River?

Hi! I’m Farmer Jake and I need your help. I will be travelling

with a fox, a goose, and a bag of corn. I have to cross a

river with a boat. However, I can only fit one thing in the

boat with me at any one time. If left alone together, the fox

will eat the goose or the goose will eat the corn. How can I

get everything across the river safely?

Explain your answer in the box below. You may draw pictures to help you in your

explanation.

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Primary 5: Rev Up! Math

4. Who’s My Neighbour?

Using only numbers cards 1 to 6, arrange the cards in the formation below such

that no two consecutive numbers are joined to one another. For example, 3

cannot be linked to 2 or 4. Each number can only be used once. Write your

answers below.

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Primary 5: Rev Up! Math

5. Getting Trolled

Imagine you are Little Red Riding Hood. It’s your grandma’s birthday and you

want to surprise her with her favourite cake.

Grandma lives at the end of the valley and you have to cross 7 bridges. Under

each bridge lives a troll. To cross the bridge, you will have to give each troll half of

the cakes you are carrying. However, as these trolls are kind, they will each give

you back a single cake.

How many cakes do you have to leave home with to make sure that you arrive at

Grandma's with exactly 2 cakes? Write your answer in the space provided below.

You may draw pictures to help you explain your answer.

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Primary 5: Rev Up! Math

6. Beary Big Hugs

There are 7 bear friends in a room. Every bear hugs each of his friends once only.

How many bear hugs will there be in total? Draw the lines below to show your

answer.

7. Feeling 8cited!

Using only addition, how can you use eight eights to get the number 1 000?

Use the box provided below to show your working.

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Primary 5: Rev Up! Math

8. Neighbouring Numbers

Take ten cards numbered 0 to 9.

Arrange the cards in the formation below such that no two consecutive numbers

are next to each other horizontally, vertically or diagonally. Write your answer in

the formation provided below. (There is more than one answer.)

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Primary 5: Rev Up! Math

9. Feeling 8cited!

During a Maths lesson, Mrs Lim asked her students to see if they could find the

sum of the first 50 odd numbers. As everyone began their addition, Thomas

raised his hand and said, "The sum is 2 500."

Mrs Lim thought, “Hmm…lucky guess."

She then gave him the task of finding the sum of the first 75 odd numbers.

Within 20 seconds, Thomas gave her the correct answer of 5 625.

How did Thomas get his answer so quickly?

Explain your answer below mathematically.

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Primary 5: Rev Up! Math

10. Lucky Number 17

Take nine cards numbered 1 to 9.

Arrange the cards in the formation below such that that the sum of numbers on

each side is equal to 17. Write your answers in the formation below.

3

68

74

15 92

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Primary 5: Rev Up! Math

11. Easy Peasy!

Divide 30 by half and add 10. What’s the answer?

Show your working in the space provided below.

This question must be done mentally IN YOUR HEAD. Try it!

Take 1000 and add 40 to it.

Add another 1000 to it.

Add 30. And add another 1000.

Add 20. Add another 1000. Now add 10.

What is the total?

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Primary 5: Rev Up! Math

12. It’s Time for T

Arrange the cut-outs pieces to form the “T” below. You have to think out of the box

for this one!

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