Mental Arithmetic Sets 19 and 20

Two sets of questions to keep those addition and subtraction skills up to scrath.

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This week the questions are all about time, including days of the month, years and centuries.

Area, perimeter, estimating and angle all come into today's questions.

Multiples, square numbers and prime numbers all feature in these sets of mental arithmetic.

Fractions, addition and subtraction are all on the menu today.

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