Контрольные задания > 234 * 2 = (200 + 30 + 4) * 2 = 200 * 2 + 30 * 2 + 4 * 2 = 400 + 60 + 8 = 468. It is convenient to write the solution in a column, using the sign x, and multiply first the units, then the tens, and then the hundreds. 1. Write the solution in a column and perform the multiplication with explanation: 123 * 3 433 * 2 122 * 4 212 * 3 221 * 4 √2. 483 + 257 820 - 164 15 * 8 : 3 6 * 16 : 8 - 2 621 + 199 9 * 9 - 59 30 * 8 : 2 6 * 16 : (8 - 2) 356 + 207 408 - 262 60 * 6 : 3 4 * 15 : 5 * 4 3. Bought 5 rolls of film, 20 m in each. Will there be enough of this film for 4 greenhouses, if
Вопрос:

234 * 2 = (200 + 30 + 4) * 2 = 200 * 2 + 30 * 2 + 4 * 2 = 400 + 60 + 8 = 468. It is convenient to write the solution in a column, using the sign x, and multiply first the units, then the tens, and then the hundreds. 1. Write the solution in a column and perform the multiplication with explanation: 123 * 3 433 * 2 122 * 4 212 * 3 221 * 4 √2. 483 + 257 820 - 164 15 * 8 : 3 6 * 16 : 8 - 2 621 + 199 9 * 9 - 59 30 * 8 : 2 6 * 16 : (8 - 2) 356 + 207 408 - 262 60 * 6 : 3 4 * 15 : 5 * 4 3. Bought 5 rolls of film, 20 m in each. Will there be enough of this film for 4 greenhouses, if

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Ответ:

1. Multiplication in columns

  • 123 * 3 = 369
  • 433 * 2 = 866
  • 122 * 4 = 488
  • 212 * 3 = 636
  • 221 * 4 = 884

2. Calculations

  • 483 + 257 = 740
  • 820 - 164 = 656
  • 15 * 8 : 3 = 40
  • 6 * 16 : 8 - 2 = 12 - 2 = 10
  • 621 + 199 = 820
  • 9 * 9 - 59 = 81 - 59 = 22
  • 30 * 8 : 2 = 120
  • 6 * 16 : (8 - 2) = 96 : 6 = 16
  • 356 + 207 = 563
  • 408 - 262 = 146
  • 60 * 6 : 3 = 120
  • 4 * 15 : 5 * 4 = 60 : 5 * 4 = 12 * 4 = 48

3. Film calculation

Total length of film: 5 rolls * 20 m/roll = 100 m

The problem statement is incomplete, so a definitive answer cannot be provided.

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