56 * 55, 99 * 32, 78 * 45, 54 * 73, 91 * 47, 32 * 67, 45 * 67, 78 * 94, 82 * 76, 78 * 81, 98 * 62

1) 56 × 55: $\begin{array}{r} 56 \\ \times 55 \\ \hline 280 \\ 280 \phantom{0} \\ \hline 3080 \end{array}$ 2) 99 × 32: $\begin{array}{r} 99 \\ \times 32 \\ \hline 198 \\ 297 \phantom{0} \\ \hline 3168 \end{array}$ 3) 78 × 45: $\begin{array}{r} 78 \\ \times 45 \\ \hline 390 \\ 312 \phantom{0} \\ \hline 3510 \end{array}$ 4) 54 × 73: $\begin{array}{r} 54 \\ \times 73 \\ \hline 162 \\ 378 \phantom{0} \\ \hline 3942 \end{array}$ 5) 91 × 47: $\begin{array}{r} 91 \\ \times 47 \\ \hline 637 \\ 364 \phantom{0} \\ \hline 4277 \end{array}$ 6) 32 × 67: $\begin{array}{r} 32 \\ \times 67 \\ \hline 224 \\ 192 \phantom{0} \\ \hline 2144 \end{array}$ 7) 45 × 67: $\begin{array}{r} 45 \\ \times 67 \\ \hline 315 \\ 270 \phantom{0} \\ \hline 3015 \end{array}$ 8) 78 × 94: $\begin{array}{r} 78 \\ \times 94 \\ \hline 312 \\ 702 \phantom{0} \\ \hline 7332 \end{array}$ 9) 82 × 76: $\begin{array}{r} 82 \\ \times 76 \\ \hline 492 \\ 574 \phantom{0} \\ \hline 6232 \end{array}$ 10) 78 × 81: $\begin{array}{r} 78 \\ \times 81 \\ \hline 78 \\ 624 \phantom{0} \\ \hline 6318 \end{array}$ 11) 98 × 62: $\begin{array}{r} 98 \\ \times 62 \\ \hline 196 \\ 588 \phantom{0} \\ \hline 6076 \end{array}$