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Name
Tutor
Topic Brain Teasers[2] (Lesson 30)

Name: __________________________________________________
Tutor: _
Topic:
__B_r_a_in__T_e_a_se_r_s_[_2_] _(_L_e_ss_o_n__3_0_)_________________________

T_OPIC NAME

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Primary 5: Rev Up! Math

Brain Teasers

Solve the following puzzles and problems. Have fun!
1. How Old?

Hi! My name is Sandy and this is my
sister Suzy.
When I was 6 years old, my sister
was half my age.
Now I am 37 years old.
How old is Suzy?
Show your answer in the box
provided below.

1

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Primary 5: Rev Up! Math

2. I’m Puzzled!

The object of this puzzle is to stack the cubes so that no pattern shows more than
once on each side. Each side of the tower should display the four different
numbers, in any order. No two numbers should be on the same side.

Write the numbers of all 4 faces of your completed tower below.

Face 1 Face 2 Face 3 Face 4

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Primary 5: Rev Up! Math

3. Shopping Surprise

Adam went to the supermarket one day and purchased 4 items. The following
shows the cost of three of the items:

$1.50 $3.00 $4.00

The line to the checkout was pretty long, so he decided to play with his pocket
calculator while waiting.

He found out, to his surprise, that the total price of the four items he had
purchased added up to the same number as if he had multiplied all four prices
together.

What was the price of the fourth item?

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Primary 5: Rev Up! Math

4. River Run

A farmer has a fox, a goat, and a cabbage. He wants to cross a river, but his boat
will hold only one item beside himself. He cannot leave the fox with the goat as
the fox will eat the goat. He can’t leave the goat with the cabbage as it will eat the
cabbage. How can he get all THREE across the river?

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

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Primary 5: Rev Up! Math

5. Watch this Space

Read the little poem and answer its question if you can.

The number of girls who do wear a watch is double the
number who don't.
But the number of boys who do not wear a watch is double
the number who do.

If I tell you that the number of girls in my class
is double the number of boys, can you tell me the number
of students I teach?
Here's a clue: More than 20 but less than 32!
Explain your answer below!

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Primary 5: Rev Up! Math

6. Cap-tain!

Remove the 8 bottle caps from your Manipulatives Pack.
Arrange all 8 bottle caps in one row such that all the bottle caps labelled Number
1 on the left and all bottle caps labelled Number 2 are on the right.
Your task is to move the tokens so that they end in alternating numbers –
1, 2, 1, 2, 1, 2, 1, 2 or
2, 1, 2, 1, 2, 1, 2, 1.

Rules:
• You are only allowed 4 moves.
• You must move two adjacent (2 bottle caps that are side by side) bottle caps

at a time.

How many tries did it take you before you completed your task?

7. Make the Switch

There are three light switches outside a room labeled 1, 2, and 3.
The door to the room is closed and you can’t see in. All three switches are off.

You need to figure out which switch belongs to each bulb in the room.
You can use the switches however you want to but can only enter the room once.
How do you do it? Explain your answer below.

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Primary 5: Rev Up! Math

8. Pick-a-toothpick
a) Using the toothpicks provided, form the following equation:

Now move only one toothpick to form a correct equation. Write the correct
equation below:

b) Now rearrange the toothpicks to form the next equation:

Now move only one toothpick to form a correct equation. Write the correct
equation below.

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Primary 5: Rev Up! Math

9. Double Trouble

What are three different whole numbers whose sum and product are equal?
Show your working below.

10. Fifteen, Please!

Arrange the numbers 1 to 9 so that the sum of the three numbers in any straight
line (vertically, horizontally or diagonally) equates 15.

Write your answer in the spaces provided below.

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Primary 5: Rev Up! Math

11. Stuck in the Middle
What can you put between a 7 and an 8 so that the result is greater than 7 but
less than 8? State your answer below.

12. 4-way Street

Use the number cards to arrange the numbers 1 to 9 so that all four equations
(three horizontal and one vertical) are correct. Write your answers in the spaces
provided below.

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