Foundation November 2017 Paper 1 Q20
20 Ami and Josh use a calculator to work out \(\dfrac{595}{4.08^2 + 5.3}\)
Ami’s answer is 27.1115
Josh’s answer is 271.115
One of these answers is correct.
Use approximations to find out which answer is correct. (3)
| Answer | Mark | Notes |
|---|---|---|
| Ami with estimate | M2 | for an approximate calculation eg \(\dfrac{600}{16+5}\) or \(\dfrac{600}{21}\) or \(\dfrac{600}{20}\) or \(\dfrac{600}{20+5}\) or \(\dfrac{600}{25}\) or \(\dfrac{600}{25+5}\) or \(\dfrac{600}{30}\) or \(\dfrac{595}{20}\) |
| (M1 | for using 600 or 5 or 4) | |
| C1 | Ami’s answer /27.1115 is closest with accurately calculated figure from approximation |