I have just published a new worksheet on writing small numbers in order, for year 1 although suitable for younger children if ready. There is more than one possible answer on most of these which makes it a little trickier.
Many children learn to recite the numbers 1 to 10 without having any concept of what each number means so it is very important to show these numbers using practical ‘hands on’ equipment such as cubes, counters etc. and to understand one-to-one correspondence. To begin with some children will need to count up in ones from 1 to find each answer
There are also many activities which can help, such as tracing numbers in sand, tracing over numbers or using number cards to rearrange a small set of numbers in order.