LESSON PLANNING OF DIVISION OF DECIMALS
Students` Learning Outcomes
- Divide a decimal by a decimal using direct division by moving decimal point.
Information for Teachers
- To divide by decimal divisors:
o Move the decimal up to required digit to make the divisor whole.
o Move the decimal in the dividend the same number of places as moved in division.
o Place the decimal straight up from the new position in the dividend.
o Now divide as;
o In this example to make divisor (0.53) a whole number (53) move the decimal point two digits to the right side as;
Material / Resources
Writing board, chalk / marker, duster, textbook
- Ask students to solve three related whole number division problems as;
- They will notice the relationship between the three problems and recall the steps required to solve division questions.
- Introduce that today we will apply the same division method to decimals with a little variations.
- Doing mathematics problems is just like eating a piece of cake. Eating a piece of cake gets difficult when we try to eat a big piece of cake all in one gulp. Let`s break it into smaller pieces, and we can eat it easily.
- Teach students the steps to dividing by decimals –model for students:
Step 1: Make the divisor a whole number by multiplying by the appropriate power of 10 (move the decimal all the way to the right)
Step 2: Multiply the dividend by the same power of 10. Add zeros if necessary (Move the decimal in the dividend the same number of places as you did for the divisor)
Step 3: Float the decimal; in the dividend straight up.
Step 4: Divide as Divide 5.39 by 1.1
- You are not dividing by a whole number, so you need to move the decimal point so that you are dividing by a whole number:
- You are now dividing by a whole number, so you can proceed:
- Ignore the decimal point and use long division :
- Put the decimal point in the answer directly above the decimal point in the dividend:
- The answer is 4.9.
- Student practice two examples= one with a decimal that terminates and one in which zeros need to be added.
- Student review writing division in different ways-and translate problems into different formats.
- Students practice independently on copies.
- Also give few questions from textbook.
Sum up / Conclusion
- Move the decimal up to required digit to make the divisor whole.
- Move the decimal in the dividend the same number of places as moved in divisor.
- Place the decimal straight up from the new position in the dividend.
- Ask students to solve following questions:
- Solve the following cross word puzzles of decimal division.