Skip-counting by 3s, 4s, 6s, 8s, and 9s means generating and interpreting sequences of whole numbers by repeatedly adding a fixed interval, typically from 0 or another stated starting number within 100. The learner connects these sequences to equal groups, multiples, repeated addition, and related multiplication facts, using number lines or hundred charts to see that each term differs from the previous term by the same amount; negative numbers, decimals, and generalized divisibility rules are beyond this scope.
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