Encourage students to use ten
frames, a number line, or a 100
Chart to help them.
Discuss with students what is
common in all these questions. See
if students can develop a
generalization about addition with
numbers that end in zero.
22
3
10
25
Strategies may vary. Possible
response: I remember when we
did "teens." So I thought of
two ten frames—one with 10,
the other with 9.
H. Strategies 2
______ = 20 + 2
30 + ______ = 33
9 + ______ = 19
20 + 5 = ______
Show or tell your strategy for solving Question C.
