1) 269 + 352 a) 700 b) 600 c) 500 2) 1,289 + 1,985 round to the nearest thousandths a) 2,000 b) 3,000 c) 5,000 3) 2,689 + 2,569 round to the nearest hundred a) 5,000 b) 5,500 c) 5,300 4) 10,568 + 12,689 round to the nearest ten thousand a) 20,000 b) 24,000 c) 26,000 5) 25,679 + 15,869 round to the nearest ten thousand a) 57,000 b) 53,000 c) 50,000 6) 26,875 + 14,897 round to the nearest thousand a) 43,000 b) 42,000 c) 41,000 7) 789 - 495 round to the nearest hundred a) 400 b) 200 c) 300 8) 2,869 - 2,365 round to the nearest thousand a) 1,000 b) 5,000 c) 2,000 9) 26,258 - 19,981 round to the nearest ten thousand a) 20,000 b) 10,000 c) 40,000 10) 67,941 - 60,895 round to the nearest thousand a) 8,000 b) 9,000 c) 7,000 11) 189,324 - 140,953 round to the nearest hundred thousand  a) 200,000 b) 100,000 c) 500,000 12) 469,432 - 348,952 round to the nearest ten thousand  a) 110,000 b) 120,000 c) 130,000

estimating sums and differences

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