2. Example 1: 3.92 + 6.48; tenths 3.92 3.9 + 6.48 + 6.5 10.4 The sum of 3.92 and 6.48 is approximately 10.4. Example 2: 8.6355 – 5.039; hundredths 8.6355 8.64 - 5.039 - 5.04 3.60 The difference of 8.6355 and 5.039 is approximately 3.60. Round to the indicated place value. Then, perform the indicated operation.

3. Example 1: 26.76 x 2.93 25 x 3 = 75 The product of 26.76 and 2.93 is about 75. Round to a compatible or “friendly number” Original problem Example 2: 42.64 ÷ 16.51 45 ÷ 15 The quotient of 42.64 and 16.51 is about 3. Round to a compatible or “friendly number” Original problem Round to the most friendly number. Then, perform the indicated operation.

4. Try these. Round to the indicated place value or most friendly number. Then, perform the indicated operation. 1.) 7.13 + 4.68; tenths2.) 9.7095 – 0.2683; thousandths 3.) 33.83 x 1.984.) 72.77 ÷ 26.14

5. If Billy wants to cycle, play ice hockey and water ski, about how many calories will he burn if he participates in each activity for 45 minutes? Use the chart to the right to answer this problem. Real-Life Application Activity (45 min)Approx. Calories Burned Cycling198.45 Hockey210.6 Rowing324 Water Skiing194.4