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.
- For instance, if you are multiplying 24 by 3:
- 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.
- For example, if you’re dividing 78 by 6:
- 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.