Question

Use the image above to solve all 4 parts of the question.

Part 1 - Write Janet’s time from Race #1 in word form.

Part 2 - Three of Janet’s times are equal when you round them to the nearest whole second. Which three times?

Part 3 - Put Janet’s times in order from fastest to slowest. Explain how you know.

Part 4 - Grace won race #4 and set a new school record. Her time was 1.8 seconds faster than Janet’s time for race #4. What was Grace’s time? Explain how you know.

Answer 1

Explanation:

A)

Janet's took 34.56 seconds to cover 50m freestyle swim.

In words it could be said as: thirty four and fifty six hundredths.

B)

Race # Time (in sec.) time( after roundoff to nearest integer)

1 34.56 35

2 35 35

3 34.8 35

4 34.137 34

5 33.92 34

Hence, the first 3 race times were equal after rounding off to nearest integer.

C)

on arranging the time of Janet's from fastest to slowest we get the table as:

Race # Time( in sec.)

5 33.92

4 34.137

1 34.56

3 34.8

2 35

since, after decimal we arrange the numbers in order same as we do for the natural numbers.

as in race #5 '33' is the smallest among all hence we keep it in first place.

for race 4,1 and 3 we have the same digit before decimals so now we have to look for the number after decimals.

D)

Janet's time in race #4 was: 34.137 sec.

But Grace was 1.8 seconds faster than Janet.

Hence, Grace time=34.137-1.8=32.337 sec.