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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.
Regrouping when adding one-digit numbers
By Khan Academy
Learn how to add 5+68 by breaking the 5 into a 2 and a 3.
Understanding Numbers and Place Value (4.NBT.2)
By School 21
Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form
Division using place value understanding
By Khan Academy
Make division problems easier by thinking about place value and using the distributive property.
Area models to visualize division using place value | 4th grade | Khan Academy
By Khan Academy
We can break up big division problems into smaller, easier problems. In this video, we solve 268 divided by 2 and 856 divided by 8.