8. 63:7 56:8 48:8 9·7 6·6 7·7 8·3-3·8 7·6-6·7 4·8-8·3 54-24:6+40 90-21+42:7 35-30:5+ 25

<ol> <li>63 : 7 = 9</li> <li>56 : 8 = 7</li> <li>48 : 8 = 6</li> <li>9 × 7 = 63</li> <li>6 × 6 = 36</li> <li>7 × 7 = 49</li> <li>8 × 3 - 3 × 8 = 24 - 24 = 0</li> <li>7 × 6 - 6 × 7 = 42 - 42 = 0</li> <li>4 × 8 - 8 × 3 = 32 - 24 = 8</li> <li>54 - 24 : 6 + 40 = 54 - 4 + 40 = 90</li> <li>90 - 21 + 42 : 7 = 90 - 21 + 6 = 75</li> <li>35 - 30 : 5 + 25 = 35 - 6 + 25 = 54</li> </ol>