#number		significance	result
2.5,		1,		3.0
-2.5,		-2,		-4.0
1.5,		0.1,		1.5
0.234,		0.01,		0.24
-2.341,		-0.1,		-2.4
8,		0,		0.0
8,		1.5,		9.0
8,		-1.5,		"#NUM!"
-8,		1.5,		"#NUM!"
-8,		-1.5,		-9.0
8.26,		0.05,		8.3
2.341,		0.05,		2.35
123.456,			"#VALUE!"
"PHPExcel",			"#VALUE!"
210.67,		1,		211.0
210.67,		0.05,		210.70
210.63,		0.05,		210.65
2.98,		2,		4.0
-2.98,		2,		"#NUM!"
-4.5,		-1,		-5.0