Divisibility rules for 3,6,& 9
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This document provides divisibility rules for numbers that are divisible by 3, 6, and 9 without actual division. It gives examples of applying these rules such as determining if 45 is divisible by 9 by adding the digits 4 + 5 to get 9, which is divisible by 9. Students then participate in an activity where they list numbers using the digits 1, 3, 5, and 9 that are divisible by 3, 6, and 9 based on the rules. Their answers are then evaluated using checks under the correct columns to indicate which numbers follow the divisibility rules.
Divisibility rules for 3,6,& 9
- 1. Divisibility Rules for 3,6,& 9 • Divide mentally • 1. 60 ÷ 6 2.45 ÷ 3 3. 81 ÷ 9 4.24 ÷ 3 5. 45 ÷ 9 • Relay Game- pupils of a team take turns in putting check mark under the correct column. 2 5 10 3 000 4 124 775 726
- 2. Who among you are officers of the SPG? As a member what do you usually do to help your schoolmate • The grade 5 pupils are setting up the social center for a program. There 180 monoblock chairs which they have set up in rows of either 3, 6, or 9. What are the possible set up • What is being asked in the problem? • What are given? • What would you do? Would you go and try it to make rows of 3, 6 & 9? Is there an easier way to do?
- 3. What do you think, Is there an easier way to arrange the chairs without doing actual division? • Yes there is, we have this divisibility rules to help us identifying if a number can be divided by another number without actual division. • Examples • Add all the given digits • Is the sum multiple of 3? 9? • Therefore the divisibility rule for 3 & 9 is, if the sum of a given number is a multiple of 3 or 9 that number divisible by 3 or 9. 1. 270 2. 1, 500 3. 1,188
- 4. Divisibility rule for 6: if the number is both divisible by 2 and 3 example: 1,350 • Group Activity: Using the digit 1, 3,5,and 9 give all the possible set/pair of numbers divisible by 3, 6 & 9. • Write or fill in the table below all your possible answer 3 6 9 1. 2. 3. 4. 5.
- 5. 3 6 9 1. 15 2. 135 135 3. 351 351 4. 531 531 5. 39 6. 93 7. 195 8. 951 9. 159 10. 51
- 6. • Evaluation: Put a check under the correct column by applying for divisibility.. 3 6 9 1. 120 2. 630 3. 423 4. 4110 5. 846
Editor's Notes
- #3: Presentation Have the pupils to solve the problem by actual division