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P. 42
Addition table

The table shows the addition of two numbers where the horizontal and
vertical rows are intersecting.

+3 5 2

2574

2+5

4796

1463

1+2

Example 1 Fill in the blanks. ⑵ 3
+5
⑴ 2
+1 2 3 5
3

⑶ ⑷
+2 3 +9 3 4
6 2
5 4
4 5

4. Speed addition 99 39
   37   38   39   40   41   42   43   44   45   46   47