Identifying an Error A student estimated the sum 7.95 + 8.11 + 78.5 + 8.05 + 79.4 + 0.815 as: All the numbers begin with a 7 or 8, so use cluster estimation 8 + 8 + 80 + 8 + 80 + 0.8 = 184.8 Explain why this reasoning is not accurate.

Which of these measurements is aboutthe same as 100 inches? a 10 centimetersb 250 centimetersc 6 metersd 30 meterswhich of these is the same as thenumber in the place-value chart? 1,000s | 100s 110s 1141 91 0a 1,994b 1,000 + 900 + 40cone thousand nine hundred fod 1 thousand 9 hundreds 4 tenswhich group of numbers is missingfrom this number pattern? 8, 12, 16, 32f 17, 18, 19g 17, 20, 23i 20, 24, 2822, 26, 30what number is missing from tnumber pattern? 20, 16, 18, 14, 16, -, 14, 10f 12g 15h 17j 18