Divide. Use partial quotients.
1.
18)648
648 divided by 18 using partial quotients:
648 - 18 = 630 (1 group of 18)
630 - 18 = 612 (2 groups of 18)
612 - 18 = 594 (3 groups of 18)
594 - 18 = 576 (4 groups of 18)
576 - 18 = 558 (5 groups of 18)
558 - 18 = 540 (6 groups of 18)
540 - 18 = 522 (7 groups of 18)
522 - 18 = 504 (8 groups of 18)
504 - 18 = 486 (9 groups of 18)
486 - 18 = 468 (10 groups of 18)
468 - 18 = 450 (11 groups of 18)
450 - 18 = 432 (12 groups of 18)
432 - 18 = 414 (13 groups of 18)
414 - 18 = 396 (14 groups of 18)
396 - 18 = 378 (15 groups of 18)
378 - 18 = 360 (16 groups of 18)
360 - 18 = 342 (17 groups of 18)
342 - 18 = 324 (18 groups of 18)
324 - 18 = 306 (19 groups of 18)
306 - 18 = 288 (20 groups of 18)
288 - 18 = 270 (21 groups of 18)
270 - 18 = 252 (22 groups of 18)
252 - 18 = 234 (23 groups of 18)
234 - 18 = 216 (24 groups of 18)
216 - 18 = 198 (25 groups of 18)
198 - 18 = 180 (26 groups of 18)
180 - 18 = 162 (27 groups of 18)
162 - 18 = 144 (28 groups of 18)
144 - 18 = 126 (29 groups of 18)
126 - 18 = 108 (30 groups of 18)
108 - 18 = 90 (31 groups of 18)
90 - 18 = 72 (32 groups of 18)
72 - 18 = 54 (33 groups of 18)
54 - 18 = 36 (34 groups of 18)
36 - 18 = 18 (35 groups of 18)
18 - 18 = 0 (36 groups of 18)
Therefore, 648 ÷ 18 = 36.