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Name Round to the Nearest 10 Models and Examples A number line can help you understand rounding. 0 10 20 When you round to the nearest 10, think 30 40 Which ten is closest? Round 37 to the nearest 10. 37 Step 1 Find 37 on the number line. 30 35 Copyright ©CSL Associates, Inc. For more practice, visit us at www.mathcoachinteractive.com 20 ↓ 40 Step 2 Decide, is 37 closer to 30 or closer to 40? 37 is closer to 40. So 37 rounds up to 40. More Examples Round 25 to the nearest 10. 25 Step 1 Find 25 on the number line. 10 ↓ 20 30 Step 2 25 is the same distance from 20 and 30! Numbers that have a 5 in the ones place always round up to the next higher 10. So 25 rounds to 30. Sometimes the nearest 10 is 0. Guided Practice Round to the nearest 10. 19 rounds to 23 rounds to 2 rounds to 67 rounds to 14 rounds to 4 rounds to © CSL Associates, Inc. (877) 790-7915 PLACE VALUE • Vol. 1• Whole Numbers Rounding to the Nearest 10 IL Workbook C 33 Name Round to the Nearest 10 Practice Round each number to the nearest 10. 10 20 30 5 rounds to 39 rounds to 4 rounds to 34 rounds to 23 rounds to 25 rounds to 80 90 100 110 83 rounds to 104 rounds to 96 rounds to 105 rounds to 99 rounds to 114 rounds to 40 Copyright ©CSL Associates, Inc. For more practice, visit us at www.mathcoachinteractive.com 0 120 Which do not round to the given number, when rounding to the nearest 10? 30 25 29 31 35 50 51 53 49 44 100 85 95 105 96 Critical Thinking True or False? Explain. If your number is half way to the next 10, round up. If your number is one-third of the way to the next 10, round up. If your number has a 1, 2, 3, or 4 in the one’s place, the closest 10 is to the left on the number line. 34 IL Workbook C PLACE VALUE • Vol. 1• Whole Numbers Rounding to the Nearest 10 © CSL Associates, Inc. (877) 790-7915 Rounding to the Nearest 10 1A−2A 4 rounds to 10 14 rounds to Rounding to the Nearest 10 IL Workbook C 0 70 20 33 Sometimes the nearest 10 is 0. PLACE VALUE • Vol. 1• Whole Numbers 67 rounds to 0 2 rounds to © CSL Associates, Inc. (877) 790-7915 23 rounds to 20 19 rounds to Round to the nearest 10. Guided Practice Numbers that have a 5 in the ones place always round up to the next higher 10. So 25 rounds to 30. Step 2 25 is the same distance from 20 and 30! Step 1 Find 25 on the number line. Round 25 to the nearest 10. 37 is closer to 40. So 37 rounds up to 40. More Examples Which ten is closest? Step 2 Decide, is 37 closer to 30 or closer to 40? Step 1 Find 37 on the number line. Round 37 to the nearest 10. When you round to the nearest 10, think 23 rounds to 4 rounds to 5 rounds to 104 rounds to 105 rounds to 114 rounds to 80 100 100 25 rounds to 20 34 rounds to 0 39 rounds to 0 110 100 100 30 30 40 34 IL Workbook C Rounding to the Nearest 10 PLACE VALUE • Vol. 1• Whole Numbers If your number has a 1, 2, 3, or 4 in the one’s place, the closest 10 is to the left on the number line. © CSL Associates, Inc. (877) 790-7915 true false If your number is one-third of the way to the next 10, round up. true If your number is half way to the next 10, round up. True or False? Explain. Critical Thinking 160'515+(($3(45 Which do not round to the given number, when rounding to the nearest 10? 99 rounds to 96 rounds to 83 rounds to Round each number to the nearest 10. Practice $2>6 A number line can help you understand rounding. 160'515+(($3(45 Copyright ©CSL Associates, Inc. For more practice, visit us at www.mathcoachinteractive.com Models and Examples $2>6 Answer Key Copyright ©CSL Associates, Inc. For more practice, visit us at www.mathcoachinteractive.com