Mental addition of several small numbers (1)

Quick timed challenge adding three or more small numbers as quickly as possible.

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Addition and subtraction of multiples of 100. Easy if you know the totals of pairs of single digits.

Knowing pairs of numbers that make 10 and being able to count in tens make these questions much quicker to answer.

Without doing any working out on paper answer these adding several numbers questions.

More practice at adding three 2-digit numbers (teen numbers only).

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