Convert between tens and ones

Learning Objectives Identify the tens and ones place in a two-digit number. Explain that a 'ten' is a bundle of 10 'ones'. Represent a two-digit number using groups of tens and ones. Convert a number like 45 into '4 tens and 5 ones'. Convert '3 tens and 7 ones' into the number 37. Use drawings to show the conversion between tens and ones. Look at your hands! 🖐️ You have 10 fingers. That's 1 group of ten! Today, we will learn a secret code for numbers! We will learn how to group numbers into tens and ones. This makes counting big numbers super easy and fun! ✨ Real-World Applications Counting crayons in a big box 🖍️ Sharing cookies with friends 🍪 Counting your toy cars 🚗 Saving coins in your piggy bank 🐷

TermDefinitionExample DigitA digit is a single symbol used to make numbers. Like 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.In the number 15, the digits are 1 and 5. 🍓 OnesOnes are single things. We count them one by one.You have 3 single apples. That is 3 ones. 🍎🍎🍎 TensA ten is a special group of 10 ones bundled together.A carton with 10 eggs is 1 ten. 🥚 Place ValuePlace value tells us how much a digit is worth based on where it is.In 28, the 2 is in the tens place. It means 2 tens (or 20). ConvertTo convert means to change something from one form to another.We can convert 1 ten back into 10 single ones. ↔️ BundleTo bundle means to group things together.We can bundle 10 straws with a rubber band to make 1 ten. 🥢

The Big Ten Rule 1 \text{ ten} = 10 \text{ ones} Use this rule to trade ones for a ten. If you have 10 single blocks, you can trade them for 1 ten-rod. The Unbundle Rule 10 \text{ ones} = 1 \text{ ten} Use this rule to trade a ten for ones. If you need more single blocks, you can break a ten-rod into 10 single blocks. Building Numbers Rule \text{Number} = \text{Value of Tens} + \text{Value of Ones} To find the total, add the value of the tens part and the ones part. For 2 tens and 3 ones, it's 20 + 3 = 23.