Everyday Formulas: Substitute and Solve
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Everyday Formulas: Substitute and Solve
Everyday formulas for Year 7: six formulas such as P = 2(l + w), s = d ÷ t, and a hire cost, with values to substitute, half of them to find a letter that is not on its own, then three formulas to write from words. With an answer key.
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Teach it first
Evaluating ExpressionsA teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 1
- Last updated
- Time
- About 20 minutes
- Answer key
- Included
- Goes with
- Evaluating Expressions with Letters
- Printing
- Black and white
- Related curriculum
-
Write expressions with letters for numbers from words, name their parts, work out their value for given numbers, and write equivalent expressions by collecting like terms and using the distributive property.
Reviewed by Mr. Daniel Carter, Teacher. How we check worksheets
How to use this sheet
- Have the child replace each variable with its value in brackets before working anything out.
- For like terms, have the child circle the terms with the same variable in the same way.
- For the distributive property, draw arrows from the number outside to every term inside the brackets.
Common mistakes
- Reading 3x as 3 plus x, or as a two-digit number when x = 4, so 3x becomes 34. It is 3 × 4.
- Multiplying only the first term inside the brackets, so 2(x + 5) becomes 2x + 5.
- Combining unlike terms, so 3x + 2 becomes 5x.
