Calculating Unit Costs of Fish Balls and Hot Dogs, and Bags and Shoes
This guide helps you understand how to calculate the unit costs of fish balls, hot dogs, bags, and shoes through practical examples from a food fair. It provides clear steps for problem-solving, including how to set up equations and check your final answers. The focus is on real-life application of unit costs, making it ideal for students learning about division and multiplication in the context of shopping and budgeting.
Calculating Unit Costs of Fish Balls and Hot Dogs, and Bags and Shoes
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Presentation Transcript
Substitution Example by Mrs Lim
Question 1 Understand During a food fair, 9 packets of fish balls and 5 cans of hot dogs cost $23. MrMuthu paid $16 for 3 packets of fish balls and 10 cans of hot dogs. How much is the unit cost of 1 packet of fish ball and 1 can of hot dog?
Plan and Solve Useful symbols ÷ Number sentences: 15 fishballs 30 • 1 fishball 30 ÷ 15 = 2 • 3 fishballs 3 x 2 = 6 • 10 hotdogs 16 – 6 = 10 • 1 hotdog 10 ÷ 10 = 1 Final statement: 1 packet of fishball costs $2 and 1 packet of hotdog costs $1
Check 1 packet of fishball $2 1 packet of hotdogs $1 3 packets of fishball $2 x 3 = $6 10 packets of hotdogs $1 x 10 = $10 Total: $6 + $10 = $16
Question 2 Understand Arjun bought 2 similar bags and 3 similar pairs of shoes for $84. If 4 bags cost the same as 1 pair of shoes, how much is the cost of 1 bag and 1 pair of shoes? =
Plan and Solve Useful symbols ÷ Number sentences: • 7 pairs of shoes 168 ÷ 7 = 24 • 1 pair of shoes 168 ÷ 7 = 24 • 4 bags 24 • 1 bag 24 ÷ 6 = 4 Final statement: 1 bag costs $4 and 1 pair of shoes costs $24
Check 1 pair of shoes $24 1 bag $6 3 pairs of shoes $24 x 3 = $72 2 bags $6 x 2 = $12 Total: $12 + $72 = $84
