Counting on and back in fifties

Counting on and back in fifties, from various starting points.

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This time it?s counting on and back in whole tens, starting with any 2-digit number.

Now were counting on and back in whole hundreds, up to 1000, starting with any multiple of 10.

Counting on in eights from various starting points.

Counting on in steps of one hundred using figures and words.

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