Question

Seb made a jump of two and a half meters Kirsty's jump was 10 centimeters longer how long was Kirsty's jump

Answer 1

First of all, a meter is equal to 100cm.
$1m=100cm$

Seb made a jump of two and a half meters. ($2 \frac{1}{2}$ or $2.5$)
Multiply 100 by 2.

$100*2=200$

Now we need the half.
What is half of 100? 
50 is half of 100.

So, add 50 to the 200.

$200+50=250$

Kirsty's jump was 10 centimeters longer.

Add 10 centimeters to the 250 centimeters.
$250+10=260$

Kirsty's jump was 260 centimeters high, or 2.55 meters.

Answer 2

2m 60cm is think because half off 100 is 50 so add 10 on and you get 60