“Facebook Live Coaching 2018 #6 Excess & Shortage


Many students are not well prepare to tackle Excess & Shortage word problems which is “non-existent” in many textbooks and workbooks. Some assessment book tend to give a quick-and-easy formula to solving excess-and-shortage problems — Strictly speaking, it’s incorrect and in fact difficult to apply when the question are tweaked or paraphrase. .

Let’s consider one of the (simplest) excess-and-shortage word problem;.

Some oranges are to be shared among a group of children.
If each child gets 3 oranges, there will be 2 oranges left.
If each child gets 4 oranges, there will be a shortage of 2 oranges.
How many children are there in the group?

If the above question were posed as a P3/4, most students would solve it either by using model or systematic lisiting.

However, at P5 & 6, these question are “twist” … the unit transfer method is often recommended. Here is an example with a twist: .


Jerry spent $82.80 on 12 cakes and 30 muffins.
If he were to buy one more cake, he would be short of $0.30.
However, if he were to buy one more muffin, he would have $1.70 left.
How much money did he have at first?

Feedback from teachers, tutors, and parents suggests that even above-average students are often confused and challenged by the variety of these so-called shortage-and-excess problems.This is one main reason why a formulaic recipe may often do more harm than good in instilling confidence in students’ mathematical problem-solving skills.

Join me in coming Wed on Facebook Live @8PM to learn the various methods of solution, helping your child to solve excess & shortage problems effectively and efficiently! All P4-6 parents are welcome to join this teaching. PM me for the broadcast link.


Notes – Uploaded