sum function not working in google sheets

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
sum function not working in google sheets	0.61	0.8	6311	43	41
sum	1.65	0.6	1528	33	3
function	0.16	0.8	5263	46	8
not	0.59	0.6	998	80	3
working	0.97	0.6	3463	25	7
in	0.31	0.2	2340	9	2
google	1.6	0.8	3166	58	6
sheets	1.99	0.5	846	30	6

Keyword	CPC	PCC	Volume	Score
sum function not working in google sheets	1.22	0.7	2896	15
sum formula not working in google sheets	0.72	0.4	6569	4
sum function in google sheets	0.36	0.6	8732	78
google sheets sum not displaying	0.45	0.2	6520	10
google sheets sum function returns 0	0.67	0.3	6636	20
google sheets sumif not working	0.6	0.6	6693	96
google sheets sum not adding up correctly	0.94	0.7	5478	50
google sheets sum if not na	1.09	0.1	5225	83
sum if google sheets	1.46	0.8	9227	56
sum in google sheets not working	0.64	0.4	1348	75
sum if formula in google sheets	0.29	0.1	5678	17
how to sum in google sheets formula	0.05	0.7	5152	60
google sheets sum formula examples	0.72	0.7	6596	40