Hello everyone!! In this video we have some examples about addition and subtraction of time measurement units - (hour, minute and second). To solve the addition and subtraction of time measurement units it is very important to know that 1 hour has 60 minutes and that 1 minute has 60 seconds. At the time of the operation we must add and/or subtract second with second, minute with minute and hour with hour. I hope you have clarified your doubts through the examples and if you liked the video click like so that more people can view it and learn from it. Thank you and a big hug Professor Angela Also watch the following videos here on the channel: Addition and Subtraction of Time Measurement Units - (hour, minute and second): • Addition and Subtraction of Time Measurement Units ... Conversion of Time Measurement Units (second, minute and hour): • Conversion of Time Measurement Units ... Conversion of Capacity Measurement Units: • Conversion of Weight Measurement Units ... Conversion of Mass Measurement Units: • Conversion of Weight Measurement Units ... Conversion of Volume Measurement Units: • Conversion of Volume Measurement Units ... Conversion of Area Measurement Units: • Conversion of Air Measurement Units ... Conversion of Length Measurement Units: • Conversion of Coarseness Measurement Units ... Ratio and Proportion - Part II: • Ratio and Proportion part II - Professor ... Ratio and Proportion - Part I: • Ratio and Proportion - Part I - Profess... Transform a decimal number into a fraction: • Transform a decimal number into a fra... Transform a fraction into a decimal number: • Transform a fraction into a decimal n... Fraction of a whole: • Fraction of a whole - Living Mathematics... Exact Square Root of a Natural Number: • Exact Square Root of a Natural N... Decomposition of a number into prime factors: • Decomposition of a number into prime fa... Numerical Expressions with Fractions: • Numerical Expressions with Fractions - Vi... Numerical Expressions with Natural Numbers: • Numerical Expressions with the Four ... Division with Natural Numbers: • DIVISION with Natural Numbers - Profes... Multiplication with Natural Numbers: • Multiplication with Natural Numbers-Vi... Addition and Subtraction with Natural Numbers: • Addition and Subtraction with Natural N... Set of Integers: • The Set of Integers (Z) ... Multiplication and division with decimal numbers: • DECIMAL NUMBERS - Multiplication and Di... Addition and subtraction with decimals: • DECIMAL NUMBERS - Addition and Subtraction... Multiplication and Division of fractions: • FRACTION - Multiplication and Division with... Addition and Subtraction of fractions: • FRACTION - Addition and Subtraction - Profes... Percentage: • PERCENTAGE - Professor Angela Mathematics... GCD - Least Common Multiple: • PROBLEMS WITH GCD - Professor Angela... GCD - Greatest Common Divisor: • GCD BY EUCLID'S ALGORITHM - VIVE... What is a fraction: • What is a FRACTION? Teacher Angela... Equivalent fractions: • Equivalent Fractions - Living the ma... Simplifying fractions: • Simplifying Fractions - Teacher... Mixed numbers: • Mixed Numbers - Teacher Angela Ma... Geometric shapes with clay: • Geometric Figures with Clay - Es... It is important to emphasize that so far the videos on this channel do not receive any sponsorship, they are made with my own resources. Angela Pereira Correia - Teacher Angela