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Lecture

Lecture 5

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School
Department
Education
Course
CURS 4240U
Professor
Ann Le Sage
Semester
Fall

Description
October 2, 2012  Math4Teachers - Class Materials - download first two links  Different methods to do mental math --> 114 + 69 o Carry the 1 in your head o Do it in pieces  100 +69 = 169 169  169 + 10 = 179  179 + 4 = 183  *importance of place value  Using fingers to count = good thing! o 70 + 100  170 + 10 = 180  180 + 4 = 184  184 - 1 = 183  (done vertically) --> add 1 to make it a "friendly number" and then subtract 1 at the end o 114 + 69  4 + 9 = 13  110 + 60 = 170  13 + 170 = 183 o 114 + 69  114 = 100 + 10 + 4  69 = 70 - 1  100 + 70 = 170  170 + 10 = 180  180 + 4 = 184  184 - 1 = 183 183 o
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