Decimals, Place Value and Rounding
Calculate with decimals while preserving scale, precision and the rounding instruction.
How to prepare for the CSNT
Use 601 original multiple-choice questions to extract the right values, preserve units and precision, and verify each calculation. The bank is independent practice based only on public skill descriptions; it contains no recalled or secure test items.
Core concepts
Concept 1
decimal place value
Exam cue: Align place values before comparing or adding decimals.
Concept 2
decimal operations
Exam cue: Keep working precision until the final requested rounding step.
Concept 3
rounding
Concept 4
significant figures
Risk pitfalls and guardrails
Rounding intermediate values too early.
Guardrail: Do not copy official questions, invent a fixed test length or weighting, ignore units, round too early, infer score from difficulty or rely on returning to an earlier item.
Confusing decimal places with significant figures.
Guardrail: Do not copy official questions, invent a fixed test length or weighting, ignore units, round too early, infer score from difficulty or rely on returning to an earlier item.
Memory anchors
Align by value
Compare decimal digits in matching place-value columns.
Round last
Retain working precision until the final answer.
Next digit decides
Use the digit immediately after the retained place.
Zero can carry scale
A displayed trailing or leading zero may matter to interpretation.
Magnitude check
A decimal answer should fit the size of the inputs.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A table shows travel claims of £18.75 and £24.60. What is the combined claim?
A meter reading rises from 126.4 to 139.85. What is the increase?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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