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This video introduces you to the concept of ratios.

This video explains how to find factors.

This video explores how to multiply and divide decimals.

This video explores how to multiply decimals by 10, 100, 1000 etc

This video explains how to round decimals.

This video explores how decimals are represented on the number line.

This video explores how to convert fractions to a decimal with tenths, hundredths and thousandths.

These videos look at how to compare decimals.

Video 1: Explores the conversion of fractions to decimals: tenths, hundredths and thousandths
Video 2: Two examples of converting fractions to decimals

This YouTube video introduces you to the basics of decimals.