the length of celia's garden is15 m 24cm. the length of her friends garden is 2 cm and 98cm more than celias. what is the length of her friends garden

15m and 24cm is 15.24m

because there's 100cm in 1m so 24cm/100cm = 0.24m

If for some reason you do need 2cm and 98cm, that's 1m so 16.24m

Now, I believe you meant to say 2m instead of 2cm for her friend's garden because it says cm twice.

If that's the case,

2m + 98cm = 2.98m

2.98m + 15.24m = 18.22m