4
Multiplication and Division
We are learning to: Multiply a decimal by a decimal. Visualise to solve puzzles. Divide a decimal by a decimal.
Day One Study the steps used to solve the problem in the example below.
If a steam engine can travel 19.75 km in 1 hour, how many kilometres could it travel in 3.5 hours?
Circle the numbers and keywords: 1 hour = 19.75 km, 3.5 hours = ? km
Top tip:
Round the values to the nearest whole number when estimating:
19.75 km 20 km 3.5 4
20 km × 4 = 80 km Always compare your
answer with your estimate.
Try these. 1
Link with operation needed (+, −, × or ÷): Multiply (×). Use a strategy: Visualise.
Estimate and calculate: My estimate: less than 80 km
19.75 km × 3.5 = 69.125 km
Answer: 69.125 km
Summarise and check how you got your answer: I drew 3 bars, each with 19.75 km and 1 bar with 9.875 km. I checked my answer by adding these four values.
The Speed Machine needs to fill up his tank before participating in a race! If petrol costs €1.25 per litre, how much will 36 litres of petrol cost?
Answer: 2 3
The Speed Machine can travel 9.75 km using 1 l of petrol. How many kilometres could he travel using 25.5 l?
The Speed Machine took a 28-day road trip across Texas. If he drove 2,086 km in total and drove the same distance each day, how many kilometres did he travel per day?
Answer: Marks: /2 Marks: /2
Answer: 20 Strand: Number Strand Unit: Operations – multiplication and division
Marks: Today’s Marks:
/2 /6
Week 4
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