In year 4 math, students learn to divide numbers by 10 and 100. These concepts are important building blocks for understanding place value and larger numbers.
To divide a number by 10, you simply move the digits one place to the right and remove the last digit. For example:
- 20 ÷ 10 = 2
- 50 ÷ 10 = 5
- 80 ÷ 10 = 8
To divide a number by 100, you move the digits two places to the right and remove the last two digits. For example:
- 200 ÷ 100 = 2
- 500 ÷ 100 = 5
- 800 ÷ 100 = 8
It’s also important to note that when dividing by 100 the number of zeros is the same as the number of digits you will remove from the number being divided.
Another way to think about it is that dividing by 10 is like moving the digits one place to the right and removing the last digit, and dividing by 100 is like moving the digits two places to the right and removing the last two digits.
For example, to divide 340 by 10, you can think of it as moving the digits one place to the right (3 tens and 4 ones) and removing the last digit, so 340 ÷ 10 = 34. Similarly, to divide 3400 by 100, you can think of it as moving the digits two places to the right and removing the last two digits, so 3400 ÷ 100 = 34.
It’s important to practice these skills and be able to divide numbers quickly and accurately. You can practice with worksheets or math games that focus on dividing by 10 and 100.
It’s also important to help students understand the relationship between multiplying and dividing by 10 and 100, such as dividing by 10 is the opposite of multiplying by 10, and dividing by 100 is the opposite of multiplying by 100. This can help students understand the concepts better and make it easier for them to solve problems.