Hint
Use the stated units and precision. Use half the stated rounding step on either side of the recorded value.
Worked solution
(a)
Use half the stated rounding step on either side of the recorded value.
\(\displaystyle \frac{26399}{200}\)
Answer: \(\displaystyle \frac{26399}{200}\)
(b)
Use half the stated rounding step on either side of the recorded value.
\(\displaystyle \frac{26401}{200}\)
Answer: \(\displaystyle \frac{26401}{200}\)
(c)
Use half the stated rounding step on either side of the recorded value.
\(\displaystyle \frac{1}{200}\)
Answer: \(\displaystyle \frac{1}{200}\)
Maths4U indicative marking guidance
Maths4U indicative marking guidance, not an official mark scheme. Credit complete valid alternative methods and consequential reasoning. An unexplained result does not earn a method mark.
(a) · 2 marks
- 1 mark: Use half the stated rounding step on either side of the recorded value.
- 1 mark: Give the correct requested result, retaining signs, units and any domain restrictions.
Alternative methods: Any complete mathematically valid alternative method with the same restrictions and equivalent exact result is acceptable.
Common error: Keep intermediate values exact until the final step.
(b) · 2 marks
- 1 mark: Use half the stated rounding step on either side of the recorded value.
- 1 mark: Give the correct requested result, retaining signs, units and any domain restrictions.
Alternative methods: Any complete mathematically valid alternative method with the same restrictions and equivalent exact result is acceptable.
Common error: Check the answer against the original conditions.
(c) · 2 marks
- 1 mark: Use half the stated rounding step on either side of the recorded value.
- 1 mark: Give the correct requested result, retaining signs, units and any domain restrictions.
Alternative methods: Any complete mathematically valid alternative method with the same restrictions and equivalent exact result is acceptable.
Common error: Keep intermediate values exact until the final step.
Total: 6 marks.