Multiply three or more numbers: word problems
Key notes :
- Understand the Problem:
- Read the problem carefully to determine what is being asked.
- Identify all the numbers involved and recognize that multiplication is needed.
- Identify Key Information:
- Look for keywords and phrases that indicate multiplication (e.g., “total,” “each,” “altogether”).
- Extract the relevant numbers and ignore unnecessary details.
- Set Up the Multiplication:
- Write down the numbers to be multiplied.
- Arrange them in a logical order for multiplication.
- Use a Step-by-Step Approach:
- Multiply two numbers at a time.
- Use the result from each step to multiply by the next number.
- Check for Reasonableness:
- Estimate the result to ensure it is reasonable.
- Compare your final answer with the estimated result to check for accuracy.
- Write a Complete Answer:
- Ensure your answer addresses the question asked.
- Include units if applicable (e.g., dollars, items).
Example Word Problems and Solutions
Problem 1: A school cafeteria prepares 3 trays of cookies for a bake sale. Each tray holds 12 boxes, and each box contains 5 cookies. How many cookies are there in total?
Solution Steps:
- Identify Key Information:
- Trays: 3
- Boxes per tray: 12
- Cookies per box: 5
- Set Up the Multiplication:
- First multiply the number of trays by the number of boxes per tray: 3×12=36
- Next, multiply the result by the number of cookies per box: 36×5=180.
- Final Answer:
- There are 180 cookies in total.
Problem 2: A factory packages 4 crates each day. Each crate contains 8 boxes, and each box holds 6 bottles. How many bottles are packaged in a day?
Solution Steps:
- Identify Key Information:
- Crates per day: 4
- Boxes per crate: 8
- Bottles per box: 6
- Set Up the Multiplication:
- First multiply the number of crates by the number of boxes per crate: 4×8=32
- Next, multiply the result by the number of bottles per box: 32×6=192
- Final Answer:
- There are 192 bottles packaged in a day.
Problem 3: A farmer plants 5 rows of corn. Each row has 10 sections, and each section contains 15 plants. How many plants are there in total?
Solution Steps:
- Identify Key Information:
- Rows: 5
- Sections per row: 10
- Plants per section: 15
- Set Up the Multiplication:
- First multiply the number of rows by the number of sections per row: 5×10=50.
- Next, multiply the result by the number of plants per section: 50×15=750.
- Final Answer:
- There are 750 plants in total.
Learn with an example
🗼 Anne is baking biscuits. She puts exactly 10 sprinkles on top of each biscuit. She places 8 rows of 5 biscuits on each biscuit sheet before they go in the oven.
How many sprinkles will Anne use on each biscuit sheet?
- Multiply the numbers in the story to find the total number of sprinkles.
- 10 × 8 × 5 = 400
Anne will use 400 sprinkles.
🗼 A biscuit factory makes 10 types of biscuits. They make 10 of each type of biscuit in every batch they bake.
How many biscuits does the factory make in 9 batches?
- Multiply the numbers in the story to find the total number of biscuits.
- 10 × 10 × 9 = 900
The factory makes 900 biscuits.
Let’s practice!🖊️