Counting to 120, tens and ones, and comparing (grade 1) · lesson

Count past 100

💡 After 100, we keep counting the same way, up to 120.

After 99 comes 100. After 109 comes 110.

116, 117, 118, 119, 120. The ones go up by one.

🧠 How to think about it

Look at the last digit. It goes 6, 7, 8, 9, then 0 as a new ten starts.

🏡 Try it at home

Count pennies or beans past 100 together. Stop at 120.

💡 A two-digit number tells how many tens and how many ones.

34 is 3 tens and 4 ones. 3 rods and 4 cubes.

60 is 6 tens and 0 ones.

🧠 How to think about it

Count the rods by tens: 10, 20, 30. Then count on the cubes: 31, 32, 33, 34.

🏡 Try it at home

Bundle 10 straws or pencils with a rubber band. Make 2 bundles and 5 extras. What number?

💡 A teen is 1 ten and some ones. A number like 70 is tens and no ones.

17 is 1 ten and 7 ones. We write the 1 first.

70 is 7 tens and 0 ones. 17 and 70 are not the same.

🧠 How to think about it

Fourteen sounds like four first. But the ten comes first: 1, then 4. So it is 14, not 41.

🏡 Try it at home

Write 14 and 41 on paper. Which one is fourteen? Build each with spoons.

💡 Compare the tens first. More tens means the number is greater.

47 > 38 means 47 is greater than 38. 38 < 47 means 38 is less than 47.

The open side of > or < faces the bigger number.

🧠 How to think about it

56 or 65? 56 has 5 tens. 65 has 6 tens. So 56 is less than 65.

🏡 Try it at home

Draw two cards from a deck to make a number. Do it again. Which is greater?