Arithmetic · real student question

Multiply 0.92 x 1.4994.

Question

Compute 0.92×1.49940.92 \times 1.4994.

Step-by-step solution

  1. Choose a strategy suited to the numbers. Long multiplication of 9292 by 1499414994 means five partial products. Because 0.920.92 is close to 11, the compensation method is far quicker: 0.92=10.080.92 = 1 - 0.08.

  2. Apply the distributive law. 1.4994×0.92=1.4994×(10.08)=1.49941.4994×0.08.1.4994 \times 0.92 = 1.4994 \times (1-0.08) = 1.4994 - 1.4994 \times 0.08.

  3. Compute the small correction. 1.4994×8=11.99521.4994 \times 8 = 11.9952, so shifting two decimal places gives 1.4994×0.08=0.119952.1.4994 \times 0.08 = 0.119952.

  4. Subtract. 1.49940.119952=1.379448.1.4994 - 0.119952 = 1.379448. Pad the first number to six decimals (1.4994001.499400) before subtracting so the columns line up.

  5. Check the decimal-place count. 0.920.92 has 22 decimals and 1.49941.4994 has 44, so the exact product must have 66: 92100×1499410000=13794481000000=1.379448\tfrac{92}{100}\times\tfrac{14994}{10000} = \tfrac{1379448}{1000000} = 1.379448. The digit count confirms nothing was dropped.

  6. Estimate to be safe. 0.920.92 is a little over 910\tfrac{9}{10}, and 910×1.5=1.35\tfrac{9}{10}\times 1.5 = 1.35, so a result slightly above 1.351.35 is expected - 1.3794481.379448 fits.

Answer

0.92×1.4994=1.3794480.92 \times 1.4994 = 1.379448

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