準２級や２級程度の問題です。３級の人もチャレンジしてください。
| 問題 | 解答 | 問題 | 解答 | 問題 | 解答 | |||||
| 10201×991 | = | 10109191 | 23533×1717 | = | 40406161 | 24139×2929 | = | 70703131 | ||
| 51005×218 | = | 11119090 | 5858×7070 | = | 41416060 | 7474×9595 | = | 71713030 | ||
| 2929×4141 | = | 12128989 | 10201×4159 | = | 42425959 | 10201×7129 | = | 72722929 | ||
| 2323×5656 | = | 13138888 | 20402×2129 | = | 43435858 | 28078×2626 | = | 73732828 | ||
| 1919×7373 | = | 14148787 | 10201×4357 | = | 44445757 | 43531×1717 | = | 74742727 | ||
| 20402×743 | = | 15158686 | 81608×557 | = | 45455656 | 7979×9494 | = | 75752626 | ||
| 51005×317 | = | 16168585 | 51005×911 | = | 46465555 | 17675×4343 | = | 76762525 | ||
| 40804×421 | = | 17178484 | 18079×2626 | = | 47475454 | 81608×953 | = | 77772424 | ||
| 10201×1783 | = | 18188383 | 4949×9797 | = | 48485353 | 10201×7723 | = | 78782323 | ||
| 20402×941 | = | 19198282 | 20402×2426 | = | 49495252 | 20402×3911 | = | 79792222 | ||
| 71407×283 | = | 20208181 | 10201×4951 | = | 50505151 | 8989×8989 | = | 80802121 | ||
| 3232×6565 | = | 21218080 | 20402×2525 | = | 51515050 | 51005×1604 | = | 81812020 | ||
| 10201×2179 | = | 22227979 | 27371×1919 | = | 52524949 | 35653×2323 | = | 82821919 | ||
| 3434×6767 | = | 23237878 | 6464×8282 | = | 53534848 | 59287×1414 | = | 83831818 | ||
| 10201×2377 | = | 24247777 | 10201×5347 | = | 54544747 | 10201×8317 | = | 84841717 | ||
| 40804×619 | = | 25257676 | 39289×1414 | = | 55554646 | 26563×3232 | = | 85851616 | ||
| 51005×515 | = | 26267575 | 51005×1109 | = | 56564545 | 13231×6565 | = | 86861515 | ||
| 19291×1414 | = | 27277474 | 6868×8383 | = | 57574444 | 14746×5959 | = | 87871414 | ||
| 4747×5959 | = | 28287373 | 10201×5743 | = | 58584343 | 10201×8713 | = | 88881313 | ||
| 81608×359 | = | 29297272 | 12827×4646 | = | 59594242 | 40804×2203 | = | 89891212 | ||
| 10201×2971 | = | 30307171 | 46157×1313 | = | 60604141 | 13433×6767 | = | 90901111 | ||
| 51005×614 | = | 31317070 | 81608×755 | = | 61614040 | 26765×3434 | = | 91911010 | ||
| 10201×3169 | = | 32326969 | 71407×877 | = | 62623939 | 10201×9109 | = | 92920909 | ||
| 4343×7676 | = | 33336868 | 20402×3119 | = | 63633838 | 40804×2302 | = | 93930808 | ||
| 3737×9191 | = | 34346767 | 10201×6337 | = | 64643737 | 22927×4141 | = | 94940707 | ||
| 20402×1733 | = | 35356666 | 40804×1609 | = | 65653636 | 20402×4703 | = | 95950606 | ||
| 51005×713 | = | 36366565 | 51005×1307 | = | 66663535 | 51005×1901 | = | 96960505 | ||
| 23129×1616 | = | 37376464 | 10807×6262 | = | 67673434 | 9898×9898 | = | 97970404 | ||
| 5353×7171 | = | 38386363 | 10201×6733 | = | 68683333 | 31613×3131 | = | 98980303 | ||
| 20402×1931 | = | 39396262 | 12322×5656 | = | 69693232 | 17069×5858 | = | 99990202 |
