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October 24, 2014

October 24, 2014

Posted by **lizzy** on Monday, November 28, 2011 at 3:46pm.

conjecture is correct or incorrect.

1. If a number is divisible by 4, it is always an even number._________________________________

2. All multiples of 5 have a 5 in the ones place.__________________________________

3. If a number has a 9 in the ones place, it is always divisible by 3.________________________________

4. The least common denominator of two fractions is always greater than the

denominators of the fractions.______________________________

5. Write a conjecture about the product of two odd numbers. Then test your

conjecture.__________________________________________________________

6. How is testing a conjecture like finding a statement to be true

or false? How is it different?_______________________________________________________________________________________________________________________

- math -
**freeda**, Monday, November 28, 2011 at 4:01pm1-incorrect ex.26,106, and 102

2-incorrect ex.110,100,and 20

3-incorrect ex.29,19,and 49

4-i'm not positive

5-the product of two odd numbers will not be divisible by a positive number. (i'm not sure)i think it's correct

6-it is the same because you are finding if the conjecture works in all case or no cases or in sometimes. it is different because in some case it may be sometimes but you don't have that option.

- math -
**Steve**, Monday, November 28, 2011 at 4:58pm4. The LCD may be the same as the denominator of one of the fractions. It will never be less than both of them.

5. The product of two odd numbers is always odd. For some m and n, let the two numbers be (2m+1) and (2n+1). Why? Any multiple of 2 is even. Add 1 to make an odd number. Multiply the two numbers and get 2mn + 2m + 2n + 1 = 2(mn+m+n)+1. This is odd because it is one more than an even number.

6. Testing a conjecture is often easy. Just try some values. Proving it is true or false is usually more involved, as in the statement #5 above.

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