Posted in MUST KNOW PSLE, Parents - PSLE, Pri Science, PSLE SCIENCE

PSLE Science question of the week

PSLE Science question of the week #1:
Banana Tree
Unripe bananas are green and contain chlorophyll.
Question: Bananas curve upwards when growing. Suggest a reason why bananas grow upwards.
Option A: They grow upwards to counteract the force of gravity
Option B: They grow upwards so that animals cannot reach and eat them before they are ripe
Option C: They grow upwards towards the sun so they can photosynthesize
Option D: They grow upwards so that they can get more carbon dioxide

Answer: Answer is C, plants always grow towards the sun in order to capture more sunlight for photosynthesis.

PSLE Science question of the week #2:

Athlete’s foot

Question: Student A has a medical condition in which fungus grows on his feet. The doctor advised student A to wear slippers instead of covered shoes. Explain how wearing slippers helps reduce the growth of fungus on the feet.

Option A: Wearing slippers allows the student to air his feet and prevent growth of fungus

Option B: Wearing slippers keeps the student’s feet dry, as fungus needs water to grow

Option C: Wearing slippers instead of shoes as fungus likes to grow on socks

Option D: Wearing slippers exposes the feet to the sun, and fungi do not like sunlight

Answer: Answer is B! Fungi needs water to grow, so it prefers damp environment. Wearing slippers allowed sweat to evaporate, keeping the feet dry and free of fungi.

PSLE Science question of the week #3

Question: A man used a hammer to drive a nail into a piece of wood. Which factor will NOT affect how deep the nail goes into the wood?

Option A: Mass of the man

Option B: Mass of the nail

Option C: Friction between the nail and the wood

Option D: Height at which the hammer was raised

Post your answer in the comments section below!

Answer: Answer is B, mass of the nail is unrelated to the amount of force or energy the man needs to hit the nail.

PSLE Science question of the week #4

When Student A closed the switch, the bulb blew. Which one of the following would have prevented the bulb from blowing?

Option A: Using fewer batteries

Option B: Closing the switch more quickly

Option C: Changing the direction of the switch

Option D: Changing the direction of all batteries

Answer: Answer is A! Using too many batteries can cause the bulb to fuse due to too much current flowing through the bulb, and heating up the filament.

Posted in Educational Advice, MUST KNOW PSLE, Parents - PSLE, Pri Math, PSLE Math

MUST-KNOW PSLE MATH PROBLEM 3

Question:

Three boys spent the same amount of money on printers.

Henry spent 2/5 of his money, Jonas spent 3/4 of his and Fred spent 2/3 of his.

They had a total of $1440  at first. How much of money did each boy spend?

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Answers:

Since Each boy spent the same amount of money, you make the numerator the same.

Henry                                    Jonas                                   Fred

2/5   x 3                                  3/4 x 2                                    2/3 x 3

6/15                                           6/8                                           6/9

The denominator now  represents the total Units they each had.

15 Units                                 8 Units                                   9 Units

TOTAl Amount: $1440

Total Units : 15+8+9= 32 Units

32 Units -> $1440

1 Unit -> $45

 Since Each of them Spent 6 units,

6 Units-> $45 x 6 = $270.

Each boy spent $270.

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KEY WORDS/THINGS TO LOOK OUT FOR?

1) It is a Fraction question

2) It has words like Spent/used the Same/Equal . 

I have made another similar sets of question  below for you to MASTER THE TECHNIQUE. Let us know what are your answers on our  Facebook Page “‘ https://www.facebook.com/SingaporeLearner/”.  All the best for your revision.

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Question 1:

Mary and Tom used the same number of beads to make jewelries.

Mary used 2/5 of hers and Tom used 3/4 of his. They both had a total of 2300 beads.

How many beads did each of them use?

 

Question 2 :

There are 540 people in Block A and Block B. 2/5 of the people in School A and 1/4 of the people in School B are Children. Given that there is an equal number of Adult in both Block A and Block B, how many Children are there in School A?