PRE-ALGEBRA
Lesson 4 of 171

ADDITION AND SUBTRACTION
Addition
Students learn to add numbers with two or more digits, such as 139 + 25. The first step is to line up the numbers vertically so that the units digits are in the same column. Next, add the units digits, the tens digits, and the hundreds digits. Adding the units digits, 9 + 5 = 14, which  more...
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