Some New Math

Divisibility Rules

During math so far 1 of the things I learned was divisibility rules. Divisibility rules are cool tricks to find out if bigger numbers are divisible by smaller numbers. We only looked at Divisibility rules from 1-10.

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• For 1, your answer will always be your number.
• For 2, your number always has to end in a 0, 2, 4, 6 or 8.
• For 3, you have to add your digit's sum until you get to 3, 6 or 9.
• For 4, you have to be able to half your number twice.
• For 5, your number has to end in 5 or 0.
• For 6, you just have to be able to do both rule 3 and 2.
• There is no divisibility rule for 7; if you find one you are a genius!
• For 8, you have to be able to half your number 3 times.
• For 9, it's the same rule as 3 except you have t go on until you reach 9.
• For 10, your number has to end in a 0.

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• For 6, you just have to be able to do both rule 3 and 2.
• There is no divisibility rule for 7; if you find one you are a genius!
• For 8, you have to be able to half your number 3 times.
• For 9, it's the same rule as 3 except you have t go on until you reach 9.
• For 10, your number has to end in a 0.

The Triangle Rule

To be able to make a triangle there is definitely a rule. The rule to make a triangle is that 2 sides of your triangle have to be longer that the other side: For example; you can not make a triangle with one side that is 8cm long and the 2 others 1cm long.

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