Math Answer Checkers

Compare a fraction, decimal, or mixed-number answer against the expected value.

Example: expected 3/4, student answer 6/8

Plug a proposed x-value back into an equation and check whether both sides match.

Example: equation 3*x + 2 = 11, x = 3

Check a quotient and remainder by rebuilding the dividend from the divisor.

Example: 157 divided by 12 = 13 R 1

Check whether a number was rounded to the selected place value correctly.

Example: 46.278 rounded to the nearest hundredth is 46.28

Check percent-of problems by converting the percent to a decimal and multiplying.

Example: 15% of 80 is 12

Find the greatest common factor or check whether a fraction reduces correctly.

Example: GCF of 18, 24, 30 is 6; 12/18 simplifies to 2/3

Check the mean, median, and mode for a list of numbers.

Example: data 2, 3, 3, 7, 10 has mean 5, median 3, mode 3

Evaluate an arithmetic expression using parentheses, exponents, multiplication, division, addition, and subtraction.

Example: 3 + 4 * (8 - 5) = 15

Check the slope between two points using rise over run.

Example: points (1, 2) and (5, 10) have slope 2

Check common length, mass, volume, and time conversions.

Example: 2.5 m = 250 cm