Topic: Estimating with a Journal Entry

Grade Level Category: 4-6

Strategy: Journal Entry

Objective:
To estimate sums using rounded factors

Materials required:
Math journal and pencil

Description of the Activity:
On the board or overhead, put the problems 65 + 28 = and 21 + 73 =. Have the students write in their journals if the estimated sum will be greater or less than the actual amount. Then explain the reason for their answer.

Scoring Rubric:
Analytic Scoring Scale

3. Complete understanding of the concept
2. Part of the concept misunderstood or misinterpreted
1. Complete misunderstanding of the concept
0. No attempt was made

Extentions:
Problems with greater place values can be used. Also subtraction or multiplication problems may be used.

Reference of Sources:
Adapted from: Scott Foresman and Company. Exploring Mathematics: Teacher's Edition, Grade 4, Volume 1 ( Chapters 1-3 ). Scott Foresman and Company: Glenview, Illinois. 1994. NTCM Analytic Scoring Scale (Charles et al., 1987)



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