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Math Ratios | MathHelp.com
By MathHelp.com
This lesson covers adding decimals. Students learn to add decimals by first lining up the decimal points, then adding the numbers by column. For example, to add 14.2 + 2.86, first line up the decimal points, then add the digits in the hundredths column, to get 0 + 6, or 6, then add the digits in the tenths column, to get 2 + 8, or 10, so write a 0 in the tenths column and carry the 1 to the units column, then add the digits in units column, to get 1 + 4 + 2, or 7, then add the digits in the tens column, to get 1. So 14.2 + 2.86 = 17.06.
Adding 3-digit numbers (no regrouping) | 2nd grade | Khan Academy
By Khan Academy
Sal adds 327 + 251 thinking about place value.
Strategies for adding 2-digit numbers | 2nd grade | Khan Academy
By Khan Academy
Sal adds and subtracts numbers like 585 and 368 using a number line. Numbers used in these problems are less than 1000.
