Please attempt the above question, timed and then click below to reveal the few second technique leading to the correct answer ==>
Technique © :
Step 1. Add all three denominations of coins =>
1+2+5 = 8
Step 2. Now convert £3.20 into 320 pence and divide it by the answer in step 1 =>
320 / 8 = 40
Step 3. Realise that the answer 40 from step 2 means that the piggy box had 40 one penny coins + 40 two pence coins + 40 five pence coins. Therefore the total number of coins is =>
40 x 3 =120
Answer: 120 coins.
Time allowed: 30 seconds
Time taken using the technique: 3 seconds
Time saved = 27 seconds [9/10th (90%) of time allowed by examiner]
Note: If you want to mentally double check your answer is right, you can now work backward starting at 40 x 1pennny (40p) + 40 x 2 pence (80p) + 40 x 5pence (200p) is = to 320 pence (£3.20) the total money was in the piggy box.
WATCH THE VIDEO WITH IN-DEPTH EXPLANATION, ON “YOU TUBE” PRIOR TO ATTENDING THE PRACTICE QUESTION.
WORK SHEET – Practice question
Jane emptied her piggy box and found that she had equal number of 10cents, 5cents and 1cent coins amounting to $4.80. How many coins were there altogether?
Technique © :
Step 1.=>
Step 2.=>
Step 3.=>
Answer:=>
