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Numbers to 20

The numbers increase by 1 to the right and increase by 10 to the down.

1 greater

1 2 3 4 5 6 7 8 9 10

10 greater

11 12 13 14 15 16 17 18 19 20

Example 1 Write the missing numbers. ⑵ 8
18


1
11 12 13

⑶ ⑷

4567 789
14
19

Example 2 Fill in the . is 1 less than  12.

⑴ is 1 greater than   9. ⑵

⑶ is 1 greater than  19. ⑷ is 10 greater than   4.

4. Missing numbers 41
   39   40   41   42   43   44   45   46   47   48   49