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A collection of short problems on place value, integers, ordering and rounding.
A collection of short problems on factors, multiples and primes.
A collection of short problems on fractions, decimals and percentages.
A collection of short problems on number operations and calculation methods.
A collection of short problems on ratio, proportion and rates of change.
Choose a couple of the sequences. Try to picture how to make the next, and the next, and the next... Can you describe your reasoning?