2. Quarter 1 Test 3 Review X. Mental Math: Multiplying & Dividing with Whole Numbers with Whole Numbers XI. Mental Math: Multiplying & Dividing with Decimals with Decimals XII. Scientific Notation XIII. Multiplication of Whole Numbers and Decimals

3. Answers: 1) 235,000,000 2) 7,020,000,000,000,000 3) 4,000,100,000 Write in standard form: 1) 2.35 x 10 8 = 2) 7.02 x 10 15 = 3) 4.0001 x 10 9 =

4. Multiply or divide mentally. 1) 300 x 400 = 2) 72,000 ÷ 80 = 3) 50 x 6,000 = 4) 120,000 ÷ 600 = 5) 60 x 900 = 6) 540,000 ÷ 9,000 = 7) 110 x 70 = 8) 36,000 ÷ 40 = 9) 300 x 500 = 10) 3000 ÷ 150 = Answer: 1) 120,000 2) 900 3) 300,000 4) 200 3) 300,000 4) 200 5) 54,000 6) 60 5) 54,000 6) 60 7) 7700 8) 900 7) 7700 8) 900 9) 150,000 10) 20 9) 150,000 10) 20

5. Write the missing number. 1) 23.3 ÷ ________ =.0233 2) 5.4 × ______ = 540 3) _________ ÷ 100 =.342 4) ________ × 1000 = 740 Answers: 1) 1000 2) 100 3) 34.2 4).74

6. Multiply or divide mentally. 1) 56.28 x100 = 2) 3.6 ÷10 = 3).39 x1000 = 4) 23 ÷ 100 = 5).123 x100 = 6) 89 ÷ 1000 = Answers: 1) 5,628 2).36 3) 390 4).23 5) 12.3 6).089

7. Multiply: 1) 538 x 72 = 2) 6,865 x 146 = 3) 3,429 x 279 = Answers: 1) 38,736 2) 1,002,290 2) 1,002,290 3) 956,691 3) 956,691

8. Answers: 1).00336 2) 874.038 3).38868 4).003225 4).003225 Multiply: 1) 1.68 x.002 = 2) 418.2 x 2.09 = 3).474 x.82 = 4) 2.15 x.0015 =

9. Answers: 1) 1.2 x 10 10 2) 6.04 x 10 8 2) 6.04 x 10 8 3) 2.3009 x 10 12 3) 2.3009 x 10 12 Write in scientific notation: 1) 12,000,000,000 2) 604,000,000 3) 2,300,900,000,000

10. Give the base: 1) ___ 2 = 6400 2) ___ 3 = 125,000 3) ___ 4 = 160,000 4) ____ 3 = 27,000,000 Answers: 1) 80 2) 50 3) 20 4) 300

11. Multiply: 1) 593 x 406 = 2) 327 x 250 = 3) 807 x 540 = Answers: 1) 240,758 2) 81,750 3) 435,780