Grade 1 Math Number worksheets - Skip Counting by 1 - Free Printable

Let’s solve this step by step.

We are skip counting by 1’s — that means we just count up normally: 1, 2, 3, 4, 5, and so on, all the way to 100.

The grid has some numbers filled in, and we need to fill in the missing ones by continuing the pattern.

Let’s go row by row:

Row 1 (starts at 1):
Given: 1 → 2, _, 4, 5, _, _, 8, _, 10
Missing: 3, 6, 7, 9
So full row: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Row 2:
Given: _, 12, 13, _, _, 16, _, 18, 19, _
We know it starts after 10, so first number is 11. Then 12, 13, then 14, 15, 16, then 17, 18, 19, then 20.
Full row: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

Row 3:
Given: _, _, 23, 24, _, 26, 27, _, 29, 30
Starts after 20 → 21, 22, then 23, 24, then 25, 26, 27, then 28, 29, 30
Full row: 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

Row 4:
Given: 31, 32, 33, _, 35, 36, _, _, 39, _
After 33 comes 34, then 35, 36, then 37, 38, 39, then 40
Full row: 31, 32, 33, 34, 35, 36, 37, 38, 39, 40

Row 5:
Given: _, 42, _, _, 45, _, _, 48, _, 50
Starts after 40 → 41, 42, then 43, 44, 45, then 46, 47, 48, then 49, 50
Full row: 41, 42, 43, 44, 45, 46, 47, 48, 49, 50

Row 6:
Given: _, 52, _, 54, 55, _, _, 58, _, _
Starts after 50 → 51, 52, then 53, 54, 55, then 56, 57, 58, then 59, 60
Full row: 51, 52, 53, 54, 55, 56, 57, 58, 59, 60

Row 7:
Given: 61, _, 63, 64, _, 66, 67, _, _, _
After 61 → 62, 63, 64, then 65, 66, 67, then 68, 69, 70
Full row: 61, 62, 63, 64, 65, 66, 67, 68, 69, 70

Row 8:
Given: _, _, 73, _, 75, _, _, 78, 79, 80
Starts after 70 → 71, 72, 73, then 74, 75, then 76, 77, 78, 79, 80
Full row: 71, 72, 73, 74, 75, 76, 77, 78, 79, 80

Row 9:
Given: 81, _, _, 84, 85, 86, 87, _, _, 90
After 81 → 82, 83, 84, 85, 86, 87, then 88, 89, 90
Full row: 81, 82, 83, 84, 85, 86, 87, 88, 89, 90

Row 10:
Given: 91, _, 93, _, _, _, 97, 98, _, 100
After 91 → 92, 93, then 94, 95, 96, 97, 98, then 99, 100
Full row: 91, 92, 93, 94, 95, 96, 97, 98, 99, 100

Now let’s write out the complete grid with all missing numbers filled in:

Row 1: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Row 2: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
Row 3: 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
Row 4: 31, 32, 33, 34, 35, 36, 37, 38, 39, 40
Row 5: 41, 42, 43, 44, 45, 46, 47, 48, 49, 50
Row 6: 51, 52, 53, 54, 55, 56, 57, 58, 59, 60
Row 7: 61, 62, 63, 64, 65, 66, 67, 68, 69, 70
Row 8: 71, 72, 73, 74, 75, 76, 77, 78, 79, 80
Row 9: 81, 82, 83, 84, 85, 86, 87, 88, 89, 90
Row 10: 91, 92, 93, 94, 95, 96, 97, 98, 99, 100

All numbers from 1 to 100 are now filled in correctly!

Final Answer:
The completed grid contains all numbers from 1 to 100 in order, filling every blank space with the correct next number in sequence.