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Adding two-digit numbers by making tens 2

By Khan Academy

Learn how to add 53+17 by breaking it apart and making a group of 10.

Adding two-digit numbers by making tens 2

By Khan Academy

Learn how to add 5+68 by breaking the 5 into a 2 and a 3.

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.

Math Ratios | 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.