MyMathKidK-8 Curriculum

Grade 1 Counting: Counting 1-20

Extend counting to 20

What You'll Learn

Count from 1 to 20
Recognize teen numbers (11-19)
Understand 20 as two tens

📖Teen Numbers

After 10 come the teen numbers: 11, 12, 13, 14, 15, 16, 17, 18, 19, then 20!

💡

Notice the pattern: thirteen has "three" in it, fourteen has "four," and so on!

Worked examples

Real problems from the practice worksheets, solved one step at a time.

Example 1
8,9,10,11, , ,14,15,16,
Fill in the missing numbers
1. This is a counting pattern — each number changes by the same amount.
2. The numbers go up by 1 each time.
3. Add 1 to fill each blank. The missing numbers: 12, 13, 17.
Answer: 12, 13, 17
Example 2
10,11,12, ,14,15,16, ,18,
Fill in the missing numbers
1. This is a counting pattern — each number changes by the same amount.
2. The numbers go up by 1 each time.
3. Add 1 to fill each blank. The missing numbers: 13, 17, 19.
Answer: 13, 17, 19
Example 3
8,9, ,11, ,13,14,15,16,
Fill in the missing numbers
1. This is a counting pattern — each number changes by the same amount.
2. The numbers go up by 1 each time.
3. Add 1 to fill each blank. The missing numbers: 10, 12, 17.
Answer: 10, 12, 17

Practice Worksheets

Counting 1-20 (Set A)

Practice counting and filling in missing numbers from 1 to 20

Counting 1-20 (Set B)

More counting practice to 20

Counting 1-20 (Set C)

Additional counting to 20

Counting 1-20 (Set D)

Keep practicing counting to 20

Counting 1-20 (Set E)

Master counting to 20

Counting to 100