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## PS RU P5L29 Work Backwards _ Simultaneous Eqns WS

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# PS RU P5L29 Work Backwards _ Simultaneous Eqns WS

### PS RU P5L29 Work Backwards _ Simultaneous Eqns WS

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Name
Tutor
Topic Brain Teasers[1] (Lesson 29)

Name: __________________________________________________
Tutor: _
Topic:
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?

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
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

2021 Copyright of PAL Solutions. No further reproduction and distribution is allowed.

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?

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

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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.

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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

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?

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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!

Show your working in the space provided below.

Take 1000 and add 40 to it.

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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