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Skip Counting
What is the rule?
The sum is the same...

Base 10
Equal sign
100
4,8,12, I am skip counting by
4
100
3,5,7,9
+2
100
5 + 7 = 12 is the same as 7 + ? =12
5
100
I have 4 tens and 0 ones
40
100
7 + 6 = ? + 7
6
200
10,20,30, 40....I am skip counting by
10
200
19, 24, 29, what is the rule?
+5
200
23 + 2 = 25 is the same as ? + 23=25
2
200
I have 3 tens and 2 ones what number am I?
32
200
11 + 9 = 9 + ?
11
300
14, 21, 28 I am skip counting by
7
300
76, 82, 88
+6
300
200 + 3 = 203 is the same as 3 + ? = 203
200
300
I have 5 tens and 5 ones what number am I?
55
300
11 + 4 = 12 + ?
3
400
105, 116, 127 I am skip counting by...
11
400
45, 41, 37,
-4
400
If you switch the terms (addends) in addition the sum always stays...
The same
400
I have 4 hundreds 0 tens and 2 ones what number am I?
402
400
23 + 2 = ? + 24
1
500
231, 251,271 I am skip counting by...
20
500
73, 63, 53, 43,
- 10
500
If I reverse the numbers in subtraction the sum will 8 - 2= 6 2 - 8=?
Change
500
I have 20 tens and 3 ones what number am I?
203
500
45 + 0 = 40 + ?
5