How Do I Add & Subtract Minutes?

In school, children are taught the basics of adding and subtracting regular numbers. However, the rules are different when it comes to adding and subtracting minutes in time. This is essential to learn, since it can make the difference between being late for something and knowing what time fifteen minutes from now is.

Instructions

    • 1

      Add the hours and the minutes of the two times for addition. For example, if you're trying to add 2:30 and 8:15, then 2 + 8 = 10 and 30 + 15 = 45. The answer is 10:45.

    • 2

      Subtract 60 from the minute sum when the sum greater than 60; for example, 61, 62, 63 and so on. The number 60 is key because there are 60 minutes in every hour. Add 1 to the hour sum if the minute number is over 60. For example, if you're trying to add 2:30 and 8:45, then 2 + 8 = 10 and 30 + 45 = 75. However, because the minute amount is over 60, the following formulas apply: 75 - 60 = 15 and 10 + 1 = 11. The answer is 11:15.

    • 3

      Subtract the hours and minutes of the two times for subtraction. For example, if you are subtracting 8:30 and 2:10, then 8 - 2 = 6 and 30 - 10 = 20. The answer is 6:20.

    • 4

      Add 60 to the minute difference if the difference is less than zero. Subtract 1 from the hour difference if this occurs. For example, if you are subtracting 8:30 and 2:40, then 8 - 2 = 6 and 30 - 40 = -10. However, because -10 is less than zero, you would utilize the following math: -10 + 60 = 50 and 6 - 1 = 5. The answer is 5:50.

    2. Previous:

    Next:

    • Parenting and Discipline Problems
      While no mom or dad wants to have a child with poor behaviors, parenting and discipline problems unfortunately go hand-in-hand. From the toddler tantrums of the terrible twos to the preschoolers overly precocious ways, and beyond into the older child
    • The Instructions for an Evenflo Playard
      Evenflo is a company that makes baby-related products including car seats, high chairs and playards. A playard is often called a "playpen" or a "pack and play" and is a place for baby to sleep and play. It is easily transported an
    • The Warning Signs of Molestation in Children
      Between 2004 and 2009, sexual abuse, commonly referred to as molestation, affected an estimated 135,300 children, or 24 percent of the child population, according to the National Incidence for Child Abuse and Neglect Report. The vast majority of chil