Virginia SOL 8.CE.1.a
The Standard
Estimate and solve contextual problems that require the computation of one discount or markup and the resulting sale price.
Virginia Standards of Learning for Mathematics · The student will estimate and apply proportional reasoning and computational procedures to solve contextual problems.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students estimate and calculate one discount or markup based on an original price. They then subtract or add that amount to find the resulting price in context.
What Mastery Looks Like
- Students identify the original price as the base and convert the percent correctly. They calculate the discount or markup, adjust the original price in the correct direction, and check against an estimate.
Common Misconceptions
- Students may multiply by the percent but report that amount as the final price. They may add a discount or subtract a markup, or use the changed price as the base instead of the original price.
How to Assess It
- Exit ticket: A $72 jacket is discounted 25%. Estimate the sale price, then find the exact discount and sale price.
Lesson moves
Ways to Teach It
Give pairs price tags and coupon cards, then have them estimate and calculate each discount or markup and final price.
Ask students to explain why a 30% discount on $80 does not make the sale price $24.
Play a matching game with cards showing original prices, percentages, adjustment amounts, and final prices.
Use store ads to compare one-discount offers, then calculate which item has the lowest sale price.
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Printable 8.CE.1.a Worksheet
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Related Standards
- 6.CE.2.d
Estimate, determine, and justify the solution to one and two-step contextual problems, involving addition, subtraction, multiplication, and division with intege...
- 8.CE.1.c
Estimate and solve contextual problems that require the computation of the percent increase or decrease.
- 8.CE.1.b
Estimate and solve contextual problems that require the computation of the sales tax, tip and resulting total.
- 4.CE.2.h
Estimate, represent, solve, and justify solutions to single-step and multistep contextual problems that involve multiplication with whole numbers.
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