LCM Table & Chart (1 to 20)

Use this chart just like a multiplication table: pick your first number along the left column, your second number across the top row, and follow them to where they meet. Every cell shows the Least Common Multiple of that pair.

Interactive 1 to 20 LCM Matrix

Hover or tap any cell to highlight its row and column intersection.

LCM(12, 18) = 36 (GCF = 6)

LCM	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
2	2	2	6	4	10	6	14	8	18	10	22	12	26	14	30	16	34	18	38	20
3	3	6	3	12	15	6	21	24	9	30	33	12	39	42	15	48	51	18	57	60
4	4	4	12	4	20	12	28	8	36	20	44	12	52	28	60	16	68	36	76	20
5	5	10	15	20	5	30	35	40	45	10	55	60	65	70	15	80	85	90	95	20
6	6	6	6	12	30	6	42	24	18	30	66	12	78	42	30	48	102	18	114	60
7	7	14	21	28	35	42	7	56	63	70	77	84	91	14	105	112	119	126	133	140
8	8	8	24	8	40	24	56	8	72	40	88	24	104	56	120	16	136	72	152	40
9	9	18	9	36	45	18	63	72	9	90	99	36	117	126	45	144	153	18	171	180
10	10	10	30	20	10	30	70	40	90	10	110	60	130	70	30	80	170	90	190	20
11	11	22	33	44	55	66	77	88	99	110	11	132	143	154	165	176	187	198	209	220
12	12	12	12	12	60	12	84	24	36	60	132	12	156	84	60	48	204	36	228	60
13	13	26	39	52	65	78	91	104	117	130	143	156	13	182	195	208	221	234	247	260
14	14	14	42	28	70	42	14	56	126	70	154	84	182	14	210	112	238	126	266	140
15	15	30	15	60	15	30	105	120	45	30	165	60	195	210	15	240	255	90	285	60
16	16	16	48	16	80	48	112	16	144	80	176	48	208	112	240	16	272	144	304	80
17	17	34	51	68	85	102	119	136	153	170	187	204	221	238	255	272	17	306	323	340
18	18	18	18	36	90	18	126	72	18	90	198	36	234	126	90	144	306	18	342	180
19	19	38	57	76	95	114	133	152	171	190	209	228	247	266	285	304	323	342	19	380
20	20	20	60	20	20	60	140	40	180	20	220	60	260	140	60	80	340	180	380	20

Sortable Pair Inspector (LCM of 12 with 1–20)

Choose a base number and sort the table by partner number, smallest LCM, largest LCM, or shared GCF.

Base number:Sort by:

Pair	LCM(12, b)	GCF(12, b)	Relationship Note
12 and 1	12	1	One number divides the other (LCM = 12)
12 and 2	12	2	One number divides the other (LCM = 12)
12 and 3	12	3	One number divides the other (LCM = 12)
12 and 4	12	4	One number divides the other (LCM = 12)
12 and 5	60	1	Coprime (GCF = 1), so LCM = 12 × 5 = 60
12 and 6	12	6	One number divides the other (LCM = 12)
12 and 7	84	1	Coprime (GCF = 1), so LCM = 12 × 7 = 84
12 and 8	24	4	Share factor 4: (12 × 8) ÷ 4 = 24
12 and 9	36	3	Share factor 3: (12 × 9) ÷ 3 = 36
12 and 10	60	2	Share factor 2: (12 × 10) ÷ 2 = 60
12 and 11	132	1	Coprime (GCF = 1), so LCM = 12 × 11 = 132
12 and 12	12	12	Identical numbers (LCM equals the number itself)
12 and 13	156	1	Coprime (GCF = 1), so LCM = 12 × 13 = 156
12 and 14	84	2	Share factor 2: (12 × 14) ÷ 2 = 84
12 and 15	60	3	Share factor 3: (12 × 15) ÷ 3 = 60
12 and 16	48	4	Share factor 4: (12 × 16) ÷ 4 = 48
12 and 17	204	1	Coprime (GCF = 1), so LCM = 12 × 17 = 204
12 and 18	36	6	Share factor 6: (12 × 18) ÷ 6 = 36
12 and 19	228	1	Coprime (GCF = 1), so LCM = 12 × 19 = 228
12 and 20	60	4	Share factor 4: (12 × 20) ÷ 4 = 60

Step-by-Step Worksheets

30 Curated LCM Worked Examples

Each page below breaks down a frequently searched pair or triple with full working, prime tables, and teacher notes.

LCM	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
2	2	2	6	4	10	6	14	8	18	10	22	12	26	14	30	16	34	18	38	20
3	3	6	3	12	15	6	21	24	9	30	33	12	39	42	15	48	51	18	57	60
4	4	4	12	4	20	12	28	8	36	20	44	12	52	28	60	16	68	36	76	20
5	5	10	15	20	5	30	35	40	45	10	55	60	65	70	15	80	85	90	95	20
6	6	6	6	12	30	6	42	24	18	30	66	12	78	42	30	48	102	18	114	60
7	7	14	21	28	35	42	7	56	63	70	77	84	91	14	105	112	119	126	133	140
8	8	8	24	8	40	24	56	8	72	40	88	24	104	56	120	16	136	72	152	40
9	9	18	9	36	45	18	63	72	9	90	99	36	117	126	45	144	153	18	171	180
10	10	10	30	20	10	30	70	40	90	10	110	60	130	70	30	80	170	90	190	20
11	11	22	33	44	55	66	77	88	99	110	11	132	143	154	165	176	187	198	209	220
12	12	12	12	12	60	12	84	24	36	60	132	12	156	84	60	48	204	36	228	60
13	13	26	39	52	65	78	91	104	117	130	143	156	13	182	195	208	221	234	247	260
14	14	14	42	28	70	42	14	56	126	70	154	84	182	14	210	112	238	126	266	140
15	15	30	15	60	15	30	105	120	45	30	165	60	195	210	15	240	255	90	285	60
16	16	16	48	16	80	48	112	16	144	80	176	48	208	112	240	16	272	144	304	80
17	17	34	51	68	85	102	119	136	153	170	187	204	221	238	255	272	17	306	323	340
18	18	18	18	36	90	18	126	72	18	90	198	36	234	126	90	144	306	18	342	180
19	19	38	57	76	95	114	133	152	171	190	209	228	247	266	285	304	323	342	19	380
20	20	20	60	20	20	60	140	40	180	20	220	60	260	140	60	80	340	180	380	20

LCM	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
2	2	2	6	4	10	6	14	8	18	10	22	12	26	14	30	16	34	18	38	20
3	3	6	3	12	15	6	21	24	9	30	33	12	39	42	15	48	51	18	57	60
4	4	4	12	4	20	12	28	8	36	20	44	12	52	28	60	16	68	36	76	20
5	5	10	15	20	5	30	35	40	45	10	55	60	65	70	15	80	85	90	95	20
6	6	6	6	12	30	6	42	24	18	30	66	12	78	42	30	48	102	18	114	60
7	7	14	21	28	35	42	7	56	63	70	77	84	91	14	105	112	119	126	133	140
8	8	8	24	8	40	24	56	8	72	40	88	24	104	56	120	16	136	72	152	40
9	9	18	9	36	45	18	63	72	9	90	99	36	117	126	45	144	153	18	171	180
10	10	10	30	20	10	30	70	40	90	10	110	60	130	70	30	80	170	90	190	20
11	11	22	33	44	55	66	77	88	99	110	11	132	143	154	165	176	187	198	209	220
12	12	12	12	12	60	12	84	24	36	60	132	12	156	84	60	48	204	36	228	60
13	13	26	39	52	65	78	91	104	117	130	143	156	13	182	195	208	221	234	247	260
14	14	14	42	28	70	42	14	56	126	70	154	84	182	14	210	112	238	126	266	140
15	15	30	15	60	15	30	105	120	45	30	165	60	195	210	15	240	255	90	285	60
16	16	16	48	16	80	48	112	16	144	80	176	48	208	112	240	16	272	144	304	80
17	17	34	51	68	85	102	119	136	153	170	187	204	221	238	255	272	17	306	323	340
18	18	18	18	36	90	18	126	72	18	90	198	36	234	126	90	144	306	18	342	180
19	19	38	57	76	95	114	133	152	171	190	209	228	247	266	285	304	323	342	19	380
20	20	20	60	20	20	60	140	40	180	20	220	60	260	140	60	80	340	180	380	20

Interactive 1 to 20 LCM Matrix

Sortable Pair Inspector (LCM of 12 with 1–20)

30 Curated LCM Worked Examples

Related Calculators & Classroom Guides

Companion Calculators

Worked Lessons & Shortcuts

LCM	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
2	2	2	6	4	10	6	14	8	18	10	22	12	26	14	30	16	34	18	38	20
3	3	6	3	12	15	6	21	24	9	30	33	12	39	42	15	48	51	18	57	60
4	4	4	12	4	20	12	28	8	36	20	44	12	52	28	60	16	68	36	76	20
5	5	10	15	20	5	30	35	40	45	10	55	60	65	70	15	80	85	90	95	20
6	6	6	6	12	30	6	42	24	18	30	66	12	78	42	30	48	102	18	114	60
7	7	14	21	28	35	42	7	56	63	70	77	84	91	14	105	112	119	126	133	140
8	8	8	24	8	40	24	56	8	72	40	88	24	104	56	120	16	136	72	152	40
9	9	18	9	36	45	18	63	72	9	90	99	36	117	126	45	144	153	18	171	180
10	10	10	30	20	10	30	70	40	90	10	110	60	130	70	30	80	170	90	190	20
11	11	22	33	44	55	66	77	88	99	110	11	132	143	154	165	176	187	198	209	220
12	12	12	12	12	60	12	84	24	36	60	132	12	156	84	60	48	204	36	228	60
13	13	26	39	52	65	78	91	104	117	130	143	156	13	182	195	208	221	234	247	260
14	14	14	42	28	70	42	14	56	126	70	154	84	182	14	210	112	238	126	266	140
15	15	30	15	60	15	30	105	120	45	30	165	60	195	210	15	240	255	90	285	60
16	16	16	48	16	80	48	112	16	144	80	176	48	208	112	240	16	272	144	304	80
17	17	34	51	68	85	102	119	136	153	170	187	204	221	238	255	272	17	306	323	340
18	18	18	18	36	90	18	126	72	18	90	198	36	234	126	90	144	306	18	342	180
19	19	38	57	76	95	114	133	152	171	190	209	228	247	266	285	304	323	342	19	380
20	20	20	60	20	20	60	140	40	180	20	220	60	260	140	60	80	340	180	380	20