Primary 6 Question

Question

There were 40 more raisin buns than strawberry buns. After 3/4 of the raisin buns and 4/5 of the strawberry buns were sold, there were 28 buns left.

(a) How many strawberry buns were there at first?

(b) What fraction of the buns sold were raisin buns?

Answer

Distance/Speed/Time Question

Question

This question came from my reader's comment

Distance between Town X and Y is 100km.
At 07:00, Sam left Town X and cycled towards Y.
Ann left Town X and cycled towards Y at 07:30.
Ann's cycling speed was 4 km/h faster than Sam. At 10:00, Ann caught up with Samuel. When Ann was 28 km from town Y, she stopped to wait for Samuel.

(a) How far was Samuel from Ann when she stopped to wait for him?

(b) How many minutes did Ann wait for Samuel?

Answer

First answer is kind of model-based, but a bit too long. I prefer the second method which uses a triangle to represent distance/speed/time relationship. Although there is little bit of algebra, I think the kid should be able to handle it.

Dear Readers

Thank you for posting all the comments and questions. My primary goal of this blog is to show my readers that most (I would think 90%) of the primary school maths questions can be solved using model based approach. I hope you can learn some of the tricks along the way and able to guide your kid in their problem sum

FYI, I will try to answer your questions if you also give it a try.

Hope this blog can help the parents as well as the kids.

Primary 6 Problem Sum

Question

A box contained 50¢ coins and 20¢ coins in the ratio 2:3. When I took out four 50¢, exchanged them for 20¢ coins, and put then put the money back into the box, the ratio became 2:7. Find the sum of money in the box.

Answer

Two different ways to solve this problem

Six Steps to Model Approach

I will be using this question to illustrate my six step approach in solving problem sum.

Questions

Aminah and Belinda each has some money. If Aminah spends $8, the ratio od the amount of money Aminah has to the amount of money Belinda has becomes 2:3. If Belinda spends $8, the ratio of the amount of money Aminah has to the amount of money Belinda has will be 11:14. How much money do they have altogether?

Answer

Primary 4 Problem Sum

Question

A fruit seller brought 350 apples for $140. 30 apples were rotten. He packed the rest in packets of 4 and sold each packet for $1. How much money did he lose from sale ?

Answer

Primary 4 Problem Sum Question

Question

Gilian spent 1/3 of her salary each month, gave 2/5 of it to her mother and saved the rest. If she saved $400 each month, what is her total salary ?

Answer