NumihanaFind 1x + 11 when x = 13.
Answer: ________________
LEARN, PRINT & PRACTISE
Substitute into simple formulae.
Substitute into simple formulae
Numihana · England Year 6
Substitute into simple formulae
Practice sheet
Name: ______________
Date: ______________
Substitute into simple formulae
Find 7x + 9 when x = 4.
Answer: ________________
Find 2x + 11 when x = 7.
Answer: ________________
Find 7x + 5 when x = 20.
Answer: ________________
Find 6x + 13 when x = 3.
Answer: ________________
Find 5x + 14 when x = 18.
Answer: ________________
Numihana · England Year 6
Substitute into simple formulae
Answer key
Name: ______________
Date: ______________
Substitute into simple formulae
Find 1x + 11 when x = 13.
Answer: 24
Find 7x + 9 when x = 4.
Answer: 37
Find 2x + 11 when x = 7.
Answer: 25
Find 7x + 5 when x = 20.
Answer: 145
Find 6x + 13 when x = 3.
Answer: 31
Find 5x + 14 when x = 18.
Answer: 104
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The skill behind this activity
Substitute into simple formulae
Department for Education: mathematics programmes of study ↗
Year 6 → Algebra · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
Replace the variable with the supplied value, multiply its coefficient first, then add the remaining constant. Substitute carefully and estimate the result.
A common slip
A coefficient next to a variable means multiplication, not two digits written next to one another.
Worked example
Find 2x + 12 when x = 3.
Answer: 18
Replace the variable with the supplied value, multiply its coefficient first, then add the remaining constant. Substitute carefully and estimate the result.