To compare decimals, line up the dots and compare one place at a time. 0.5 is more than 0.45, because 5 tenths beats 4 tenths.
Worked example
6.75 ? 6.8
Answer:6.75 < 6.8
Line the places up. Compare tenths first: 7 against 8. Written to the same length they are 6.75 and 6.80, so 6.75 < 6.8.
For grown-ups: Compare decimals to hundredths. Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.
CCSS 4.NF.C.7
What this practises, for teachers
Practices compare decimals to hundredths (4.NF.C.7). A printable sheet with its answer key, worked answers on the page, no accounts.