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Heuristics ApproachHeuristics ApproachAce Ratio Method Ace Ratio Method

(ARM)(ARM)Solving Challenging Primary Mathematical ProblemsSolving Challenging Primary Mathematical Problems

Adrian NgAdrian NgPrincipal TrainerPrincipal Trainer

BEFORE AND AFTER CONCEPT

ACE RATIO METHOD (ARM)

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SINGLE UNCHANGED QUANTITIES

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In a farm, there were as many chickens as ducks. After 49 ducks were sold, the percentage of ducks dropped to 40%. Find the number of chicken in the farm.

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First Change End

Chicken

Duck

4u

5u

5

4

- 49

100

40

)(5

)(2

Total

Duck

3p

2p

x312u

x412u

x315u

x48u

15u-8u 497u 491u 7

12u 12x7 = 84

Ans: 84 chickens

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