developing and understanding addition strategies.Number charts offer versatile ways to explore numerous math skills such as: Questions such as 86 + 14 can be solved using the 1-100 chart but not the 0-99 chart.Questions such as 16 - 16 can be solved using the 0-99 chart but not the 1-100 chart.In both charts, moving one row directly down from any given value is the same as adding 10 while moving one row above a given value is the same as subtracting 10.In both charts, moving one square to the right is equivalent to adding 1 while moving one square to the left is equivalent to subtracting 1.Seeing all the values from the same decade in the same row helps reinforce place value concepts. Values in any given row all contain the same number of groups of ten and then some number of ones. On a 0-99 chart, all the numbers in each decade appear in the same row (e.g., 20, 21, 22.Seeing 0 as the first value in the 0-99 chart helps to emphasize this fact. Zero is a number, in its own right, not just a digit in values such as 50.So, the 1-100 chart might be preferred for counting activities. Flip individual cards, rows, columns or all cards at once. The mathies interactive Number Chart tool includes two number charts (0-99 and 1-100), an addition chart (to 12 + 12), and a multiplication chart (to 12 x 12).
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