Multiply three or more numbers: word problems

Key notes :

  1. Understand the Problem:
    • Read the problem carefully to determine what is being asked.
    • Identify all the numbers involved and recognize that multiplication is needed.
  2. Identify Key Information:
    • Look for keywords and phrases that indicate multiplication (e.g., “total,” “each,” “altogether”).
    • Extract the relevant numbers and ignore unnecessary details.
  3. Set Up the Multiplication:
    • Write down the numbers to be multiplied.
    • Arrange them in a logical order for multiplication.
  4. Use a Step-by-Step Approach:
    • Multiply two numbers at a time.
    • Use the result from each step to multiply by the next number.
  5. Check for Reasonableness:
    • Estimate the result to ensure it is reasonable.
    • Compare your final answer with the estimated result to check for accuracy.
  6. 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:

  1. Identify Key Information:
    • Trays: 3
    • Boxes per tray: 12
    • Cookies per box: 5
  2. 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.
  3. 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:

  1. Identify Key Information:
    • Crates per day: 4
    • Boxes per crate: 8
    • Bottles per box: 6
  2. 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
  3. 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:

  1. Identify Key Information:
    • Rows: 5
    • Sections per row: 10
    • Plants per section: 15
  2. 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.
  3. Final Answer:
    • There are 750 plants in total.

🗼 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.

  • 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.

  • 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!🖊️