6th grade Q1

Let’s see how you can solve multi-step problems involving multiplication and addition of decimals using appropriate problem solving strategies.

Example:

You are at the market to buy some fruit. Oranges cost ₱250.50 per kilo, and grapes cost ₱100.50 per kilo. You buy 1.5 kilos of oranges and 2 kilos of grapes. How much will you spend in total?

Let’s solve this problem step by step:

1. Understand

What is asked? How much will you pay in total for 1.5 kilos of oranges and 2 kilos of grapes?

What are the given facts? Cost of 1 kilo of oranges: ₱250.50. You buy 1.5 kilos of oranges. Cost of 1 kilo of grapes: ₱100.50. You buy 2 kilos of grapes.

2. Plan

• What operations will be used?
  Multiplication to find the cost of oranges and grapes, and addition to find the total cost.
• What are the number sentences?

Cost of oranges: $250.50\times 1.5$

Cost of grapes: $100.50\times 2$

Total cost: Cost of oranges $+$ Cost of grapes

3. Solve

Use what you know about multiplication of decimals:

• Multiply to find the cost of oranges:
  $250.50\times 1.5=375.75$
• Multiply to find the cost of grapes:
  $100.50\times 2=201.00$
• Add to find the total cost:
  $375.75+201.00=576.75$

Final Answer:

You will pay ₱576.75 in total for the fruits.