Mental math workout
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This book presents designed "think exercises" for a mental math workout and hands-on, do-it-yourself activities, using inexpensive supplies.
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This book presents designed "think exercises" for a mental math workout and hands-on, do-it-yourself activities, using inexpensive supplies.
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"This book presents designed "think exercises" for a mental math workout and hands-on, do-it-yourself activities, using inexpensive supplies."
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