🔢 MathGrade 4Lesson 37
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Real-World Math Project

Lesson preview: the Mini Lesson and Vocabulary are open to everyone. Guided practice, exercises, the parent checklist and the printable PDF worksheet come with full access (free 7-day trial or membership).

Learning Objectives

  • 1Apply math skills to solve real-world problems
  • 2Use measurement, money, and data to make decisions
  • 3Present mathematical thinking clearly
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Mini Lesson

Real-world math connects math skills to everyday life: shopping, cooking, building, and travel. In this project lesson you will apply everything learned this year to solve practical problems.

Money

  • Calculate totals by multiplying price by quantity.
  • Make change: subtract the cost from the amount paid.
  • Compare prices to find the better deal.
  • Find a discount: multiply the original price by the percentage (as a decimal).

Measurement

  • Choose the right unit for the job: km for long distances, m for rooms, cm for small objects.
  • Convert between units: 1 km = 1 000 m, 1 kg = 1 000 g, 1 L = 1 000 mL.
  • Estimate quantities before measuring to check your answer is reasonable.

Data

  • Read graphs carefully — check the scale and axis labels first.
  • Find totals by adding all values; find averages by dividing the total by the number of items.
  • Use data to make decisions and justify your answer.
Real-World Math ConnectionsReal-World Math ConnectionsShoppingMoney- Calculate totals- Make change- Find discountsCookingFractions- Double recipes- Half quantities- Mix ratiosBuildingArea/Perimeter- Perimeter: fencing- Area: carpet- Volume: spaceTravelDistance/Speed- Distance = speed x time- Convert km/m- Read maps
Money and Measurement Quick ReferenceMoney and Measurement ReferenceMoney ($)Total:price x quantityChange:paid - costDiscount:original x (% / 100)e.g.$20 - $12.50 = $7.50MeasurementLength:1 km = 1000 m = 100 cmMass:1 kg = 1000 gCapacity:1 L = 1000 mLArea:length x width
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Tip: always write the units in your answer (m, kg, $, etc.) so your working is clear.

Vocabulary
discount
An amount taken off the original price.e.g. A 25% discount on $40 saves $10.
total
The full amount when prices or values are added together.e.g. Three books at $5 each give a total of $15.
change
The money returned after paying more than the cost.e.g. Pay $10 for a $7 item — your change is $3.
distance
How far apart two points are, measured in length units.e.g. The distance from home to the library is 2 km.
average
The total of values divided by how many there are.e.g. The average of 4, 6, and 8 is (4+6+8) ÷ 3 = 6.
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