Multiplying and Dividing Whole Numbers

Multiplying and Dividing Whole Numbers

Understanding the Concept of Multiplication and Division

  • Multiplication and division are two fundamental operations used in mathematics.
  • Multiplication is the process of adding a number to itself a certain number of times.
  • Division is the process of dividing a number into equal parts.

Methods for Multiplying Whole Numbers

  • The Standard Algorithm: This method involves arranging the numbers vertically and then multiplying each digit of the first number with each digit of the second number.
    • For instance, if you are multiplying 24 by 3:
      • Align the numbers vertically and then multiply each digit of 24 by 3.
      • 4 * 3 = 12, write down the 2 and carry the 1. Then, 2 * 3 = 6 plus the 1 carried over gives 7.
      • The result is 72.
  • It’s important to remember to line up your numbers correctly, with the ones place under the ones place, the tens place under the tens place, etc.

Methods for Dividing Whole Numbers

  • Long Division: This method can be used to divide large numbers.
    • For example, if you’re dividing 78 by 6:
      • Write 78 inside the division bracket and 6 outside.
      • Now divide 7 by 6. The result is 1, write this above the division bracket.
      • Multiply the 1 by 6 and subtract it from 7. Write the answer 1 down.
      • Carry down the next number which is 8. Repeat the process until the division is complete.
      • The result is 13.
  • Continue until there are no more digits to bring down or the remainder cannot be divided evenly by the divisor.

Practice Problems

  • Problem: Multiply 35 by 4.
    • Solution: 140
  • Problem: Divide 80 by 5.
    • Solution: 16
  • Problem: Multiply 17 by 6.
    • Solution: 102

Understanding and Always Double Checking

  • Always double check your calculations to make sure they are correct.
  • Mastering multiplication and division will make more advanced mathematical concepts such as fractions, percentages, and algebra a lot less daunting.
  • Remember these methods for multiplying and dividing whole numbers and practice as much as possible.