Topic 3 of 8
Step 3: Adding and subtracting to 20
Counting to 120
Step 3 · Adding and subtracting to 20 topics
Count past 100 to 120, starting from any number, and read and write the numbers as you go.
Counting past 100
After 99 comes 100, one hundred. Then counting starts the pattern again: 101, 102, 103, just like 1, 2, 3 with "one hundred" in front.
| After | comes |
|---|---|
| 99 | 100 |
| 109 | 110 |
| 119 | 120 |
100 is ten tens. 110 is eleven tens. 120 is twelve tens.
Reading and writing numbers to 120
Write the numbers you say: one hundred four is 104, with a 0 in the middle because there are no extra tens. One hundred fourteen is 114.
| Say it | Write it |
|---|---|
| one hundred one | 101 |
| one hundred eight | 108 |
| one hundred twelve | 112 |
| one hundred twenty | 120 |
Counting on from any number
You can start anywhere. From 96, count on: 97, 98, 99, 100, 101. Crossing 100 is just like crossing any ten.
Example: Counting on
Start at 108 and count on 5. Where do you stop?
- 109, 110, 111, 112, 113.
- After 109 comes 110, a new ten.
Answer113
Try it yourself
Work each one on paper first, then open the answer to check.
What comes after 99?
Show answer
100.
What comes after 109?
Show answer
110.
Write one hundred six.
Show answer
106.
Count on 4 from 117.
Show answer
118, 119, 120, 121. You stop at 121.
What comes just before 120?
Show answer
119.