Numbers & Operations — Quiz 2

Questions in this quiz (10)

1. If $$a$$ is an odd integer and $$b$$ is an even integer, which of the following expressions must be even?

   • $$ab+1$$
   • $$2a-b$$
   • $$a+b$$
   • $$a^2 + b$$

2. Which of the following numbers is a prime number?

   • 39
   • 51
   • 73
   • 85

3. Which of the following expressions represents the product of two consecutive even integers?

   • $$n(n+1)$$
   • $$4n^2+4n$$
   • $$2n^2+1$$
   • $$4n^2-1$$

4. When an integer is divided by $$5$$, its remainder is $$2$$. The value of that integer could be:

   • 10
   • 14
   • 17
   • 15

5. During a school event, Maria sorted 850 stickers into envelopes, with each envelope holding 18 stickers. If Maria gets to keep the leftover stickers, how many stickers does she get to keep?

   • 3
   • 5
   • 4
   • 6

6. When expressed in scientific notation, the number $$0.00082$$ is:

   • $$0.82 \times 10^{-6}$$
   • $$8.2 \times 10^{-5}$$
   • $$8.2 \times 10^{-3}$$
   • $$8.2 \times 10^{-4}$$

7. A gym offers a weekly membership for a flat fee of $$50$$, which includes access to two workout classes per day. Each additional class taken on a given day costs $$8$$ extra. If Sarah takes two classes every day from Monday to Sunday, and adds a third class on Friday, Saturday, and Sunday, how much will her total gym bill be for the week?

   • 58
   • 74
   • 50
   • 64

8. If $$x = 4$$ and $$y = 9$$, which of the following is the closest approximation to $$\frac{x+y(x-2)^2(x^2-y)}{x(y^2+2)}$$?

   • $$\frac{256}{332}$$
   • $$\frac{4}{7}$$
   • $$\frac{25}{7}$$
   • $$\frac{81}{7}$$

9. The quotient of two numbers is 5. One of them is $$b$$. Express their difference in terms of $$b$$.

   • $$4b$$
   • $$5b$$
   • $$b$$
   • $$3b$$

10. The first of three increasing consecutive odd numbers is $$3n-1$$. Express the last number in terms of $$n$$.

    • $$3n+2$$
    • $$3n+4$$
    • $$3n+3$$
    • $$3n+5$$