O-LevelMathematicsNumber4024/12 · May/June 2019 · Q42 Marks
By writing each number correct to one significant figure, estimate the value of 71.8 - 32.4 0.198²
- By writing each number correct to one significant figure, estimate the value of 71.8 - 32.4 0.198²[2]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [2] 70 and 30 and 0.2 seen and final answer 1000
- [B1] for two of 70, 30 and 0.2 seen
- [SC1] If 0 scored, SC1 for 72-32 = 40 and 40 / 0.2² or 40 / 0.04 seen with final answer 1000
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