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Place Value 3
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Math Mammoth Place Value 3 is a self-teaching work text that focuses in on 4-digit numbers: it teaches place value with thousands, and adding and subtracting 4-digit numbers. The book is not tied to any grade level but best suits third grade. The emphasis is on trying to get familiar with numbers that have thousands and 'visualize' them on a number line. Rounding and estimating are also included - very important skills needed in everyday life. The book practices adding and subtracting 4-digit numbers both mentally and in columns. Order of operations is studied as concerning addition and subtraction, including several connections with algebraic thinking.

Sample Pages (PDF):

Four-Digit Numbers and Place Value 
Subtract 4-Digit Numbers with Regrouping
Rounding to Nearest Hundred

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