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Use this abacus to work on your place value of Thousands, Hundreds, Tens and Ones. Hide the numbers at the top and see if you can recognise the number shown by the beads or ask someone to give you a 3-digit number and you place the correct beads on the abacus. Can you add 100? Now subtract 10?
This interactive hundred square can be used to count on on back with addition or subtraction. We have learned to count forwards in ones or count down in tens. It can also be used to find multiples when working on our times tables. This requires Flash so cannot be used on an iPad or tablet.