What expression can be used for estimating 868÷28?
1 answer:
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It has a factor of 2*3*5=30
what is the biggest number that is a multipule of 30
hmm
9000
9900
9990 is the biggest
30*333=9990
the summation of an arithetic sequence where first term is a1 and last is an and the number of terms is n
30 *2=60
that's 2 terms
30*3=90
30,60,90
3 terms
so 30*n means n terms
9990=30*333 means 333 terms
n=333
a1=30
an=9990
s=1668330
answer is 1,668,330
what is the biggest number that is a multipule of 30
hmm
9000
9900
9990 is the biggest
30*333=9990
the summation of an arithetic sequence where first term is a1 and last is an and the number of terms is n
30 *2=60
that's 2 terms
30*3=90
30,60,90
3 terms
so 30*n means n terms
9990=30*333 means 333 terms
n=333
a1=30
an=9990
s=1668330
answer is 1,668,330