GK 2015 Q2
2. Which of the following numbers is closest to 2.015 × 510.2?
- A 0.1
- B 1
- C 10
- D 100
- E 1000
Grey Kangaroo 2015, Question 2. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: E 1000
Round each number in the product to one significant figure to give 2 × 500 = 1000. Hence 1000 is closest to the given product.
Solution © UK Mathematics Trust, from the GK 2015 solutions.