12 Insider Maths Tips That A* Students Swear By

By: Rebecca Seow

1

The fact that ‘guess-and-check’ has the word ‘check’ in it, requires students to have a column to check and present to the examination marker whether their ‘guessed’ answer is the correct one. Failing to insert a ‘check’ column might result in the loss of marks for the question.

2

How can you apply this tip?

An example of using a ‘check’ column is shown below:

Samuel has 10 coins that add up to \$3.80. Some are 50 cents and the rest are 20 cents coins. How many 50 cents coins does he have?

(Source: ACSJ SA2, 2013)

Solution:

 No of 50ȼ coins Value of 50ȼ coins No of 20ȼ coins Value of 20ȼ coins Total value of coins Check 5 \$2.50 5 \$1.00 \$3.50 × 6 \$3.00 4 \$0.80 \$3.80 √

He has 6 50ȼ-coins.

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Posted on 03/11/2016

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