When you count by twos beginning with 0, you are
naming the even numbers.
0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22...
When you count by twos beginning with 1, you are naming the odd
numbers.
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21...
Fill in the blanks with the correct number.
1, 3, 5, ,
,
, 13,
, 17, 19...
2, 4, 6, 8, 10, ,
,
,
, 20...
23, 25, , 29,
,
,
, 37, 39...
52, 54, 56, 58, ,
,
,
, 68...
30, ,
,
,
,
, 42,
, 46...
17, ,
,
,
,
, 29,
, 33...
83, ,
,
,
,
,
,
, 99...
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