Question

Edward wants to determine which skateboarder won a race. The actual time taken by four skateboarders to skate the same distance is shown below:


Skateboarder A B C D
Time (in seconds) 4.28 4.24 4.26 4.25


If the stopwatch can measure to the nearest tenth of a second, which skateboarder will show as having a different time from the others?

Answer 1

hint: round each number to the nearest tenth

do you know how to round 4.28?

Answer 2

nope. :/

Answer 3

ok, to round to the nearest tenth, we look at the second digit after the decimal point

4.28, the second digit after the decimal point is 8, so we round up to 4.3, with me so far?

Answer 4

yes

Answer 5

good, now remember the rounding rule: if the digit is 5 or more, we round up. if the digit is 4 or less, we round down

can you try rounding 4.24 on your own now?

Answer 6

4.2?

Answer 7

good!

now round 4.26

Answer 8

4.3

Answer 9

good, now round 4.25

Answer 10

4.3 as well

Answer 11

good! so A, C, and D round to 4.3

B rounds to 4.2 so B is our answer

Answer 12

okay, thank you! :)