Basic Skills Review

Prime Time

100

What is the divisibility rule for 5? 

Ends in 5 or 0

200

What is the divisibility rule for 6? 

If the sum of the digits is even and is divisible by 3 (adds up to a multiple of 3). 

Example: 96 is divisible by 6 because 9+6=15 (multiple of 3) and it is even 

300

List the first 8 prime numbers

2, 3, 5, 7, 11, 13, 17, 19

400

Find the prime factorization of 150

2 x 3 x 5 x 5

500

Find the prime factorization of 108

2 x 2 x 3 x 3 x 3

Bits and Pieces

100

Write 1/3 as a decimal and a per cent (round at the hundredths place)

1 divided by 3 = 0.33

33.33 per cent 

200

Write 1/25 as a decimal and a percent 

1/25 = 4/ 100 so it is 4 per cent or 0.04

300

Write 0.08 as a fraction over 100, simplified fraction, and a percent

8/100

2/25

8 per cent 

400

Write 1.42 per cent as a fraction over 100, a simplified fraction, and a decimal

1 and 42/100

1 and 21/50

0.0142

500

Write 3/8 as a decimal and a percent.

3 divided by 8 = 0.375

37.5 per cent 

Let's Be Rational

100

What is 2/3 of 18? 

12 

200

What is 11/13 plus 1/7? 

90/91 (to find the LCM of two prime numbers, multiply them together. Change the fractions to equivalent fractions with your new denominator)

300

What is 4 and 1/3 minus 2 and 5/6? Simplify

1 and 1/2 (did you line up the numbers vertically? did you find common denominators for the fractions? did you borrow from the 4?)

400

What is 4 and 2/5 times 10/11? 

4/1 = 4 (did you turn the mixed number into an improper fraction? did you multiply the numerators and multiply the denominators?)

500

What is 2 and 1/3 divided by 1/6? 

14 (did you turn mixed numbers into improper fractions? did you keep change flip in that order?)

Decimal Ops

100

Round 3.7891 to the hundredth's place. 

3.79

200

12.49 plus 82.7779

95.267 (line up the decimals, add zeroes if necessary)

300

3 minus 1.45

1.55 (if you made a mistake, check that you added zeroes after the 5's decimal point and borrowed)

400

3.67 times 194

711.98 (if you made a mistake, check for the following: placeholder zeroes, silly errors, moving the decimal 2 times to the left). 

500

18.2 divided by 0.07

260 

Powers of 10

100

How many place values does the decimal move if you divide or multiply by 10,000?

4 times 

200

What's 46.2 times 100?

4,620

300

What's 348.9 divided by 100?

3.489

400

What is 0.347 divided by 10 to the power of 3? 

0.000347 (move the decimal to the left three times because it's divided by 10 three times)

500

What is 10 per cent of $37.89?

$3.79 (round to the hundredths place because there is no coin smaller than a cent)