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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Get ready for 4th grade
Get ready for addition, subtraction, and estimation
Get ready for addition, subtraction, and estimation
Rounding to the nearest 10 or 100
Strategies for adding two and three-digit numbers
Strategies for subtracting two and three-digit numbers
Adding and subtracting within 1,000