Download chapter 10. operations: standard and alternative algorithms

Modeling Written Algorithms
with Concrete Materials
Examine the following problems. Use base-ten
blocks and/or other concrete materials to model
the "common" algorithms for addition,
subtraction, multiplication, and division. Compare
your models with those used in our text. Page
numbers are indicated in parentheses.
+
27
35
(p. 214)
Modeling Written Algorithms
with Concrete Materials
There were 61 children who did not sign up
for hot lunch. There were 22 of these who
went home for lunch. The rest brought a
cold lunch. How many brought a cold
lunch? (p. 218)
x
15
19
(p. 223)
7) 52 (p. 228)
How Many Strategies?
Examine the following problems. How
many different ways can you solve them
using mental computation and/or written
computation? Compare your strategies with
those used in our text. Page numbers are
indicated in parentheses.
Problems
Jill and Jeff both collected
baseball cards. Jill had 27
cards and Jeff had 35. How
many did they have
together? (p. 213)
x
14
2
(pp. 220, 221)
4) 54
-
74
58 (p. 218)
(pp.226,227)