Hint
Use the stated units and precision. Identify the last retained place and inspect the following digit before rounding.
Worked solution
(a)
Identify the last retained place and inspect the following digit before rounding.
\(770\)
Answer: \(770\)
(b)
Identify the last retained place and inspect the following digit before rounding.
\(4.21\)
Answer: \(4.21\)
(c)
Identify the last retained place and inspect the following digit before rounding.
\(770\)
Answer: \(770\)
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: Identify the last retained place and inspect the following digit before rounding.
- 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: Identify the last retained place and inspect the following digit before rounding.
- 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: Identify the last retained place and inspect the following digit before rounding.
- 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.