Mathematics Week 4 LESSON 39.pp grade 4t
- 1. MATH 5-Lesson 39-Q2-Week 4. Multiplies decimals up to 2 decimal places by 1 to 2 digit whole numbers. M5NS-IId-111.1, MISOSA Grade 5 Module- Multiplication of Decimals and Whole Numbers.
- 2. DRILL: Give the product mentally. 12 x4 22 x3 32 x4 43 x3 54 x5 REVIEW: Tossing Dice Materials: two dice with the following faces. 1.2 ,3.5 ,2.6 , 4.1 ,1.3 ,3.3 Mechanics: a. Distribute 2 cubes to each group. b. One pupil rolls the cube and the other records the face up digit. c. The group who gives the most number of correct answers wins the game.
- 3. MOTIVATION: Which are decimals? Which are whole numbers? 15 891 What’s the difference between a whole number and a decimal number? Can we multiply the two numbers?
- 4. Presentation: Rudolf lives 2.4 km from school. How far does he ride in going to and from the school? Group the pupils and have them perform the task. a. How far is Rudolf’s house from the school? b. What is being asked in the problem?
- 5. Performing the Activity: To find the answer we multiply 2.4 by 2. Solution: a. Multiply just like whole numbers. 2.4 x 2 Steps 2 x 4 = 8 8 b. Count the decimal places in the factors. 2 x 2 = 4 4 c. The number of decimal places in the product is equal to the sum of the decimal places in the factors.
- 6. Processing the Activities: After the activity, see to it that the teacher immediately sets remedial for those who got the wrong answers. Did you learn something from the activity? How did you get the answer? Did you follow the steps?
- 7. Reinforcing the Concept and Skills: Explore and Discovery: Look at this square. What is its perimeter How can you find the perimeter? How many sides has a square? 3.5 cm What can you say about its side?
- 8. Because there are 4 equal sides and each measures 3.5 cm, we can compute this as 4 x 3.5 = N. Here’s how this is done. 3.5 cm 3.5 x 4 Steps a. Multiply just like whole numbers. 4 x 5 = 2 0 0 2 4 x 3 = 12 + 2 = 14 14 b. Count the decimal places in the factors. c. Place the decimal point in the product. The decimal place in the product is equal to the total number of decimal places in the factors. one decimal place
- 9. Get Moving: Multiply. Choose your answer from the choices given inside the parenthesis. 1.) 4 x 7.28 = ( a. 29.19 b. 291.2 c. 2.912 ) 2.) 7 x 3.14 = ( a. 20.98 b. 21.98 c. 22.98 ) 3.) 3 x 6.25 = ( a. 18.25 b. 18.5 c. 18.75 ) 4.) 2 x 12.25 = ( a. 25.1 b. 25.12 c. 25.13 ) 5.) 6 x 5.75 ( a. 34.5 b. 3.45 c. 0.345 )
- 10. Summarizing the Lesson: Lead the pupils to generalize that: To multiply decimals by whole numbers, multiply like whole numbers then count the number of decimal places in the factors. The sum of the number of decimal places in the factor is equal to the number of decimal places in the product.
- 11. Applying to New and Other Situations: a. Complete the table by giving each product. X 2.6 11.92 4 _____ _____ 12 _____ _____ b. Andrei bought apples at P15.50 each. How much did he pay for 5 apples?
- 12. Apply Your Skills! Solve the following problem. 1.) If a notebook is ₱ 5.25, how much is the cost of 6 notebooks? 2.) A working student earns ₱ 25.50 an hour. How much does he earn in 4 hours? If he works 3 days a week, how much does she earn a week? 3.) Mrs. De Guzman’s class rode is 3.8 mile to the observatory. The next closest observatory is 13 times as far. How many miles is the second observatory?
- 13. Assessment: Copy and give the product. Give the missing numbers. 1.) 0.76 2.) 0.12 3.) 16.57 X 4 X 5 X 6 1. If 367 x 28 = 10276, what is 36.7 x 28 equal to? 2. If 163 x 7 = 1141, what is 1.63 x 7 equal to?
- 14. Home Activity: Write the product with the decimal point in the correct place. Then be ready to read your answer. Enrichment: Marina's car gets 44.8 miles per gallon on the highway. If her fuel tank holds 15.4 gallons, then how far can she travel on one full tank of gas? 1.) 6.48 2.) 20.6 3.) 3.65 4.) 2. 34 5.) 12.23 X 32 X 18 X 23 X 12 X 13