Lesson Planning of Basic Operations on Decimals

Lesson Planning of Basic Operations on Decimals (Multiplication & Division)

Subject Mathematics

Students` Learning Outcomes

• To multiply a decimal by 2 digit number
• Divide a decimal by a 1-digit number (quotient being a decimal up to two decimal places)

Information for Teachers

• While finding the product of two decimal numbers observe the following steps.
• While dividing a decimal number with 1-digit number and write the answer up to two place of decimals if it can`t divide fully.

• Multiply the numbers ignoring the decimal points.
• Count the digits o the right side of the factors and get the “sum”.
• Put the decimal point in the product counting the digits from the right side according to the “sum”.

Material / Resources

Writing board, chalk/marker, duster, paper and pencils for the whole class

Introduction

• There are four operations that we apply do you know what are they? (Expected answer may be as; [+, x, ÷, -]).
• We have done addition and subtraction up till now and now we are going to do multiplication and division.
• First we will revise the multiplication and division done with 10, 100 and 1000 and then we will work out other decimal values with same operation.

Development

 Activity 2 Let the class split into groups of not more than 4 in each. Assign a question bank from the textbook. Allocate time and let them drill the skill. Later discuss few questions as the whole class. The whole class discussion: T: we discussed about division in the beginning. T: Does the place value increases or decreases? Ss: yes, decreases and the decimal point move to right. T: What would be the answer of 8.8 ÷ 8? Ss: let then think. T: the rule is, “Proceed with the division as you normally would except put the decimal point in the answer or quotient exactly above where it occurs in the dividend”.

 Activity 3 Individual work: Write some question on board. Repeat the rule with the whole class. Allocate time [15 minutes] Collect notebooks once a;; question are done or / the time is over. Appreciate correct work.

 Activity 4 Textbook activity: Ask students to solve practice questions given in their mathematical work. Repeat the rules for multiplication and division by saying wrong rule. for example, when we multiply with 10 or 100 decimal point moves backward (wrong) Observe how quickly they reply.

Sum up / Conclusion

• While finding the product of two decimal numbers observe the following steps.
• While dividing a decimal number with 1 digit number write the answer up to two place of decimals if it can`t divide fully.
• The rule is, “Proceed with the division as you normally would except put the decimal point in the answer or quotient exactly above where it occurs in the dividend”.

Assessment

Division

0.66 ÷ 2 = _______

0.03 ÷ 3 = ______

0.02 ÷ 2 _______

0.54 ÷ 6 = _____

0.96 ÷ 2 = _____

0.56 ÷ 4 = _____

0.44 ÷ 2 = _____

0.16 ÷ 8 = _____

0.90 ÷ 5 = _____

0.75 ÷ 5 = ____

0.60 ÷ 3 = _____

0.88 ÷ 4 = _____

0.42 ÷ 2 = _____

0.80 ÷ 5 = ______

Multiplication

25 x 0.31 = ______

14 x 0.8 = ______

28 x 0.78 = ______

33 x 0.88 = ______

10 x 0.47 = ______

10 x 0.0 = _______

47 x 0.95 = ______

52 x 0.2 = ______

10 x 0.2 = _______

14 x 0.53 = ______

10 x 0.7 = ______

25 x 0.3 = _______

18 x 0.63 = ______

29 x 0.51 = ______

91 x 0.3 = _________