Taken separately, the 21 Level 1 MathStart books would rank among the largest Early Math series for Pre-K ! 

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Pattern Recognition

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Recognizing Shapes

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Opposites

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Hours

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 Counting by 5s and 10s

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Subtracting One

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Sequencing

Comparing Sizes

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Doubling Numbers

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Ordinals

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Counting On

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Comparing Weights

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Number Order

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Matching Sets

Directions

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Counting

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Understanding Capacity

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Comparing Amounts

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Odd and Even Numbers

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Matching

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Sorting

List of all 63 
MathStart Books

Level 1 Order Form

Level 2 Order Form

Level 3 Order Form