KCS - Curriculum Based Measurement

In CBM Math, which is first administered in winter of first grade, worksheets containing a mix of problems requiring different math operations are given to students in a group situation. Directions are read. Students are told to begin and they complete as many of the problems in the allotted time period (from 2 to 4 minutes depending on the grade level). Credit is given for every correct digit in the answer. For example if the answer was 83 and the response was 73, one correct digit would be awarded for that problem.

AIMSweb® Growth Table
M-CBM Computation
Knox County Schools District Norms 2006-2007

		Fall		Winter		Spring
Grade	%ile	Num	CD	Num	CD	Num	CD	ROI
1	90	0	0	3969	19	3994	23	0.2
	75		0		14		17	0.2
	50		0		10		13	0.2
	25		0		6		9	0.2
	10		0		3		5	0.1
	Mean		0		11		14
	StdDev		0		6		7
2	90	21763	19	23336	35	24033	42	0.6
	75		14		29		31	0.5
	50		10		22		23	0.4
	25		7		14		16	0.3
	10		5		9		11	0.2
	Mean		11		22		25
	StdDev		6		11		13
3	90	3788	24	3757	34	3755	40	0.4
	75		19		27		33	0.4
	50		14		22		25	0.3
	25		11		16		18	0.2
	10		9		12		13	0.1
	Mean		16		22		26
	StdDev		7		9		11
4	90	3886	55	3811	72	3824	77	0.6
	75		43		55		62	0.5
	50		34		42		47	0.4
	25		25		33		35	0.3
	10		18		24		25	0.2
	Mean		36		46		50
	StdDev		16		21		22
5	90	3739	48	3687	54	3673	70	0.6
	75		39		45		59	0.6
	50		31		37		48	0.5
	25		24		27		36	0.3
	10		17		18		25	0.2
	Mean		32		37		47
	StdDev		13		15		17
6	90	10064	51	10568	64	10113	67	0.4
	75		38		48		51	0.4
	50		29		36		35	0.2
	25		21		26		26	0.1
	10		17		20		20	0.1
	Mean		32		39		40
	StdDev		16		18		19

Num = Number of Students CD = Correct Digits
ROI = Rate Of Improvement

ROI is Spring Score minus Fall Score (or Winter minus Fall) divided by 36 weeks (or 18 weeks)

A fifth grade student at the 50th percentile obtained 38 correct digits during the winter benchmark.

Curriculum Based Measurement

Curriculum-Based Measurement

Math Computation Norms


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