Rhode Island Standards
RI.M:N&O:6. NECAP - Grade Level Expectation: Number and Operation.
M:N&O:6:6. Uses a variety of mental computation strategies to solve problems (e.g., using compatible numbers, applying properties of operations, using mental imagery, using patterns) and to determine the reasonableness of answers; and mentally calculates change back from $5.00, $10.00, $20.00, $50.00, and $100.00; multiplies a two-digit whole number by a one-digit number whole number, two-digit whole numbers that are multiples of ten, a three-digit whole number that is a multiple of 100 by a two- or three-digit number which is a multiple of 10 or 100, respectively; divides 3- and 4-digit multiples of powers of ten by their compatible factors; and determines the part of a whole number using benchmark percents (1%, 10%, 25%, 50%, and 75%).