MCAS Math Grade 3 cheat sheet

Multiplication is repeated addition of equal groups: 4 × 3 means 4 groups of 3, which equals 3 + 3 + 3 + 3 = 12.

Division splits a total into equal shares or into groups of a given size: 12 ÷ 3 = 4 because 12 splits into 4 groups of 3.

Multiplication and division are inverse operations, so 6 × 7 = 42 gives both 42 ÷ 6 = 7 and 42 ÷ 7 = 6.

A whole number is even if it can be split into two equal whole-number parts (ends in 0, 2, 4, 6, or 8); otherwise it is odd.

Rounding to the nearest 10 or 100: find the two tens or hundreds the number sits between, then choose the closer one; a 5 in the deciding place rounds up.

Place value in a 4-digit number: each place is 10 times the place to its right, so in 3,472 the 4 is worth 400 and the 7 is worth 70.

Fractions describe equal parts of one whole: the denominator counts how many equal parts make the whole, the numerator counts how many parts are taken.

Two fractions are equivalent when they name the same point on a number line, such as 1/2 = 2/4 = 3/6.

Area of a rectangle equals length × width, found by counting unit squares or multiplying side lengths; perimeter is the distance around, found by adding all side lengths.

Multiplication is repeated addition of equal groups: 4 × 3 means 4 groups of 3, which equals 3 + 3 + 3 + 3 = 12.

Division splits a total into equal shares or into groups of a given size: 12 ÷ 3 = 4 because 12 splits into 4 groups of 3.

Multiplication and division are inverse operations, so 6 × 7 = 42 gives both 42 ÷ 6 = 7 and 42 ÷ 7 = 6.

A whole number is even if it can be split into two equal whole-number parts (ends in 0, 2, 4, 6, or 8); otherwise it is odd.

Rounding to the nearest 10 or 100: find the two tens or hundreds the number sits between, then choose the closer one; a 5 in the deciding place rounds up.

Place value in a 4-digit number: each place is 10 times the place to its right, so in 3,472 the 4 is worth 400 and the 7 is worth 70.

Fractions describe equal parts of one whole: the denominator counts how many equal parts make the whole, the numerator counts how many parts are taken.

Two fractions are equivalent when they name the same point on a number line, such as 1/2 = 2/4 = 3/6.

Area of a rectangle equals length × width, found by counting unit squares or multiplying side lengths; perimeter is the distance around, found by adding all side lengths.

Multiplication is repeated addition of equal groups: 4 × 3 means 4 groups of 3, which equals 3 + 3 + 3 + 3 = 12.

Division splits a total into equal shares or into groups of a given size: 12 ÷ 3 = 4 because 12 splits into 4 groups of 3.

Multiplication and division are inverse operations, so 6 × 7 = 42 gives both 42 ÷ 6 = 7 and 42 ÷ 7 = 6.

A whole number is even if it can be split into two equal whole-number parts (ends in 0, 2, 4, 6, or 8); otherwise it is odd.

Rounding to the nearest 10 or 100: find the two tens or hundreds the number sits between, then choose the closer one; a 5 in the deciding place rounds up.

Place value in a 4-digit number: each place is 10 times the place to its right, so in 3,472 the 4 is worth 400 and the 7 is worth 70.

Fractions describe equal parts of one whole: the denominator counts how many equal parts make the whole, the numerator counts how many parts are taken.

Two fractions are equivalent when they name the same point on a number line, such as 1/2 = 2/4 = 3/6.

Area of a rectangle equals length × width, found by counting unit squares or multiplying side lengths; perimeter is the distance around, found by adding all side lengths.

Multiplication is repeated addition of equal groups: 4 × 3 means 4 groups of 3, which equals 3 + 3 + 3 + 3 = 12.

Division splits a total into equal shares or into groups of a given size: 12 ÷ 3 = 4 because 12 splits into 4 groups of 3.

Multiplication and division are inverse operations, so 6 × 7 = 42 gives both 42 ÷ 6 = 7 and 42 ÷ 7 = 6.

A whole number is even if it can be split into two equal whole-number parts (ends in 0, 2, 4, 6, or 8); otherwise it is odd.

Rounding to the nearest 10 or 100: find the two tens or hundreds the number sits between, then choose the closer one; a 5 in the deciding place rounds up.

Place value in a 4-digit number: each place is 10 times the place to its right, so in 3,472 the 4 is worth 400 and the 7 is worth 70.

Fractions describe equal parts of one whole: the denominator counts how many equal parts make the whole, the numerator counts how many parts are taken.

Two fractions are equivalent when they name the same point on a number line, such as 1/2 = 2/4 = 3/6.

Area of a rectangle equals length × width, found by counting unit squares or multiplying side lengths; perimeter is the distance around, found by adding all side lengths.