Stage: 2 Short Challenge Level: 
Perhaps you could try two consecutive numbers and see how close you
are?
Do you have sense of how big the numbers will be?
Do you have sense of how big the numbers will be?
Addition & subtraction. Odd and even numbers. Generalising. Trial and improvement. Interactivities. Divisibility. Properties of numbers. Multiplication & division. Working systematically. Factors and multiples.
Published May 1999.
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