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038_G1U30_G2U6˙—» ¿º 2011.3.22 5:14 PM ˘ ` 128 PDF_In 2540DPI 150LPI T
Unit
30 What Is the Missing Number?
Use the pictures below to write addition and subtraction
sentences.
40 ? 80
40 + 40 = 80
80 - 40 = 40
20 50
?
= 50
20 +
50 - 20 =
128
Unit
30 What Is the Missing Number?
Use the pictures below to write addition and subtraction
sentences.
40 ? 80
40 + 40 = 80
80 - 40 = 40
20 50
?
= 50
20 +
50 - 20 =
128
