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What is meant by “divisibility rules”? A way to divide numbers quickly by following a pattern. Why is it important? Divisibility rules help us find the factors of a number.
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Students in a grade 7 class were raising money for charity. Some students had a “bowl-a-thon”.
This table shows the money that one student raised for different bowling times.
Time (h) Money Raised
($)
1 6
2 16
3 24
4 32
5 40
What patterns do you see in the table?
How long would the student have to bowl to raise $72?
What is meant by “divisibility rules”?A way to divide numbers quickly by following a pattern.
Why is it important?Divisibility rules help us find the factors of a number.
Copy down the following numbers.
78 27 35 410
123 2100 4126 795
Circle the ones that are divisible by 2.
Place a square around the ones that are divisible by 5.
Draw a triangle around the ones that divisible by 10.
A number is divisible by…2 If the whole number is even3 If the sum of the digits is divisible by 34 If the number formed by the last 2 digits is
divisible by 45 If the last digit is a 5 or a 06 If the number is divisible by 3 and is even8 If the number is divisible by 4 and the quotient
is even9 If the sum of the digits is divisible by 9
10 If it ends in 0
1) Choose 3 different colors.2) Using one color, circle the numbers that are
divisible by 2.3) Using a different color, circle all the numbers that
are divisible by 4.4) Using your last color, circle all the numbers that
are divisible by 8.
Be able to discuss the following:Describe the patterns that you found.
Sort the following numbers based on the divisibility rules for 3 and 5 using both Carroll and Venn Diagrams.
6, 8, 10, 15, 18, 25, 26, 36, 40, 45, 120
Carroll Diagram
Divisible by 3
Not Divisible by
3Divisible by
515 45
12010 25 40
Not Divisible by
5
6 36 18 8 26
Divisible by 5 Divisible by 3
8 26
102540
61836
1545120
Grade 6:
Work on page 14 then Pizazz sheet
Grade 7:
Work on pages 8 then 9 and the Pizazz sheet for final review