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