Pre-Algebra

Arithmetic

100

380-381+382-383...-409+410

What is 400?

200

3(2\div4\times32-9)

What is 21?

Divisibility

100

If 24,6N8 is divisible by 9, what is the value of N?

What is N = 5?

200

B is a units digit in the four digit number 4,63B. If 4,63B is divisible by 3 and 4, then what is the value of B?

What is 2?

Multiples and Factors

100

lcm(18,66)

198

200

gcd(126,189)

63

Prime

100

Two prime numbers have a sum of 30 and difference of 8. What is the product of the two numbers?

What is 209?

200

How many prime numbers between 40-55?

What is 4?