Recognising and continuing number patterns is the earliest stage of algebra, but the name isn't used until much later, usually at High School. The easier patterns are counting on in ones and twos, but these pages also include counting on and back in threes, fives and tens. If children have had plenty of practice counting out loud they should not have any problems recognising the patterns and completing them.
It is a good idea to ask your child what the pattern, or sequence, is eg 'going up in threes'.
These maths worksheets can be found in our Superbrain section under Counting and Number
Go to our Number pattern worksheets