Practice books you can print at home. Each has 50+ problems that grow from picture-and-count basics up to big numbers, with an answer key for grown-ups. Open a book and press Print.
Add the two groups together and write how many there are altogether. The first problems have pictures to count; later ones use bigger numbers.
Start with the first number and take the second away. Cross out the pictures to help, then write how many are left.
Multiplication is equal groups. Count the rows and columns of pictures, then write the total. Later problems use bigger numbers.
Division is sharing into equal groups. Share the pictures into the number of groups, then write how many are in each group. Later problems use bigger numbers.
Count how many pictures there are and write the number in the box. The groups get bigger as you go, arranged in rows of ten to make them easy to count.
Trace the light grey numbers to practise writing them, then write each one yourself in the empty boxes. A gentle first step for little hands.
Count in steps — by 2s, 5s, 10s and 3s. Fill in the missing numbers in each sequence to spot the pattern.