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Unit 2 Post-Test: Computing with Whole Numbers & Decimals Study Guide – Test *Thursday January 26, 2017 I. Adding and subtracting with decimals and with money Remember to always line up place values! Add “place holder zeroes” if needed. II. Know and be able to use and apply the 3 properties of multiplication and/or Addition Commutative Property 4x6=6x4 Associative Property 2 x (3x 8) = 3 x (2x8) Distributive Property 6 x 24 = (6x20) + (6x4) OR 2 x (3+8) = (2x3) +(2x8) III. Multiplication Estimation by rounding to the highest place value, or rounding to 10, 100, or 1000. 2 by 2, 3 by 1 or 3by 2-digit multiplication with or without decimals. You can use traditional, expanded or array method. When asked to use a model, use array or place value (dot) methods. With decimals, multiply as if the decimals are not there, then estimate or “count decimal places” to determine correct place value. IV. Division Divide numbers with 2,3, and 4 digit dividends and both 1 or 2 digit divisors Divide numbers with whole numbers and decimals in the dividend. Estimate using compatible numbers; 512 ÷ 67 ≈ 490 ÷ 70 = 7 V. Word Problems Underline question. Write down what you know. Choose operation and solve. Check answer fits back into question. Use CSRQ for final answer and be sure to include units!