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036_G1U28_G2U4˙—» ¿º 2011.3.22 5:8 PM ˘ ` 112 PDF_In 2540DPI 150LPI T
Activity 2 Add 2-Digit Numbers
1 Find the sum of 2-digit numbers.
12 + 33 = ? Add the ones. Add the tens.
tens ones tens ones
12 12
+3 3
+3 3
5
Add the ones.
Then add the
tens.
a1 2 b2 6
+8 5 +3 1
c6 5 d7 7
+2 3 +2 2
112
Activity 2 Add 2-Digit Numbers
1 Find the sum of 2-digit numbers.
12 + 33 = ? Add the ones. Add the tens.
tens ones tens ones
12 12
+3 3
+3 3
5
Add the ones.
Then add the
tens.
a1 2 b2 6
+8 5 +3 1
c6 5 d7 7
+2 3 +2 2
112
