Primary 5 Maths [DEMO]

3. The figure below is made up of a rectangle and a triangle. The length of the rectangle is
5 times its breadth. The total length shown is 50 cm and the partial base of the triangle is 8 cm.
Find the area of the shaded triangle.

Answer: cm²

📖 REMINDER: Use length = 5 × breadth to find breadth first. 

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4. Mr Tan has some money. If he buys 10 pens, he will be short of $30. If he buys 7 pens, he will have $12 left.
How much money does Mr Tan have?

Answer: $ 

📖 REMINDER: Difference in pens = 10 − 7 = 3. Total money difference = $30 + $12 = $42. Find price per pen first, then calculate total money.

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5. Sam had 84 yellow and purple balloons. ⁵⁄₇ of the balloons were purple. He bought some orange balloons.
There were 3 times as many yellow balloons as orange balloons. How many orange balloons did Sam buy?

Answer: orange balloons

📖 REMINDER: First find how many purple and yellow balloons there were initially. Then use the ratio between yellow and orange balloons to find how many orange balloons were bought.

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6. A store was having a promotion. Donuts were sold at $1.50 each and three donuts were given free for every 12 donuts purchased.
Mrs Tan needed 36 donuts for a party, how much did she have to pay?

Answer:  $

📖 REMINDER: For every 12 donuts purchased, she gets 3 free. Calculate how many sets of 12 she needs to buy to get 36 total donuts, then determine how many she actually pays for.

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7. Lena spent ¹⁄₆ of her savings on some art supplies. She spent ²⁄₃ of her remaining savings on some craft materials and had $40 left.
How much was Lena's savings?

Answer:  $

📖 REMINDER: Work backwards from what's left. After the second purchase, $40 represents the fraction of savings remaining after both purchases.

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