5p weighs 3grams
what would be the weight of £5.00 in grams

Compare the tenths digit of all numbers:

.33
.275
.25
.3

The lower tenths digits will go on the bottom, and the higher tenths digits will go on the top:

.33
.3
.275
.25

Compare the hundredths digit of all numbers:

.33
.3

3 > 0

.275
.25

7 > 5

From thickest to thinnest, the order is .33 mm, .3 mm, .275 mm, and .25 mm.