Art. 3. To multiply a number by 52: number, to which add twice the number. Take 50 times the 1700 +681768 (c) Find the sum of the twelve products. (d) Find the sum of the twelve products. Art. 5. To multiply a number by 331: Multiply of the (e) Find the sum of the twelve products. Art. 6. To multiply a number by 341: the number, to which add the number itself. Take 33 times 800 +24= 824 833 +25=858 (f) Find the sum of the twelve products. Art. 7. To multiply a number by 351: the number, to which add twice the number. Take 33} times 800 +48 848 = 823+50 = 8831 27 by 351 (g) Find the sum of the twelve products. Art. 8. To multiply a number by 321: Take 83 times the number, from which subtract the number itself. Why? (h) Find the sum of the twelve products. Art. 9. To multiply a number by 25: Multiply of the (i) Find the sum of the twelve products. Art. 10. To multiply a number by 26: Take 25 times the number, to which add the number itself. Why? (j) Find the sum of the twelve products. Art. 11. To multiply a number by 27: Take 25 times the number, to which add twice the number. Why? (k) Find the sum of the twelve products. Art. 12. To multiply a number by 24: Take 25 times the number, from which subtract the number itself. Why? (1) Find the sum of the twelve products. Art. 13. To multiply a number by 20: Multiply of the number by 100. How may a number be multiplied by 21? (m) Find the sum of the twelve products. Art. 14. To multiply a number by 163: Multiply of the number by 100. How may a number be multiplied by 173? by 18? by 15% ? (n) Find the sum of the twelve products. Art. 15. To multiply a number by 124: Multiply \ of the number by 100. How may a number be multiplied by 13? by 14? by 11? times 32 = 400 400+32 = 432 32 × 13 12 (0) Find the sum of the twelve products. Art. 16. To multiply a number by 125: Multiply of the How may a number be multiplied by 126? number by 1000. by 127? by 124? 96 × 126 125 times 96 = 12000 12000 + 96 = 12096 Art. 17. To multiply a number by 250: Multiply of the number by 1000. by 252? by 249? How may a number be multiplied by 251? of 48 × 1000 = 12000 250 times 48 = 12000 12000 + 48 = 12048 48 × 250 48 × 251 |