Question

Use mental math, estimation, and the division algorithm to evaluate the expressions.1. 118.4 - 6.42. 314.944 - 3.73. 1,840.5072 +23.564. 325 - 2.55. 196 +3.56. 405 + 4.57. 3,437.5 +5.58. 393.75 +5.259. 2,625 + 6.2510. 231 + 8.2511. 92 +5.7512. 196 + 12.2513. 117 - 6.514. 936 + 9.7515. 305 + 12.2

Answer 1

We just have to solve each operation.

118.4 - 6.4 = 112

314.944 - 3.7 = 311.244

1,840.5072 + 23.56 = 1864.0672

325 - 2.5 = 322.5

196 + 3.5 = 199.5

405 + 4.5 = 409.5

3,437.5 +5.5 = 3443

393.75 +5.25 = 399

2,625 + 6.25 = 2631.25

231 + 8.25 = 239.25

92 + 5.75 = 97.75

196 + 12.25 = 208.25

117 - 6.5 = 110.5

936 + 9.75 = 945.75

305 + 12.2 = 317.2