This student counted Ahmad's coins as only the 50-cent and 5-cent coins (50¢ + 5¢ = 55¢), missing the 20-cent coin. Then 55¢ + 70¢ = $1.25.
PRIMARY 1 · MATHEMATICS
Money
Top 5 mistakes
Ranked by how often they appear across 11 MOE-aligned practice questions in our archive.
This student missed Ahmad's 5-cent coin, counting only 50¢ + 20¢ = 70¢ for Ahmad. Then 70¢ + 70¢ = $1.40.
This student counted Siti's 2 ten-cent coins as 3 ten-cent coins (50¢ + 30¢ = 80¢ for Siti). Then 75¢ + 80¢ = $1.55.
Counted only the 50-cent and 20-cent coins, forgetting the 10-cent coins.
Computed 1.00 + 0.60 + 0.10 instead of including 5 × 0.10.
Want to fix these mistakes for your child?
Superholic Lab's quiz engine flags every misconception by name and routes your child to targeted practice in our 3-day Plan Quest. Free 7-day trial.
Start a free 7-day trial →