Grade 1 Math: How to Build Teen Numbers with Ease

Understanding Teen Numbers 🔢

Teen numbers (11-19) can be tricky for first graders because they don't follow the same naming pattern as other numbers. They represent a group of ten and some extra ones. Here's how to help your child build teen numbers with ease:

Place Value Introduction ➕

Start by reinforcing the concept of place value. Explain that numbers are made up of tens and ones. Use manipulatives like base-ten blocks or even simple objects like straws to represent tens and ones.

Building with Manipulatives 🧱

Use base-ten blocks (or similar objects) to physically build teen numbers. For example, to build 13, use one 'ten' block and three 'one' blocks.

• Visual Representation: Lay out the ten block and then the individual ones next to it.
• Verbalization: Say, "This is ten, and these are three ones. Together, they make thirteen."

Decomposition Strategy ➗

Break down the teen number into its components: 10 + [some ones]. This reinforces the idea that a teen number is a ten and some additional ones.

1. Example: For 15, show it as 10 + 5.
2. Practice: Have your child practice decomposing different teen numbers.

Ten Frames 🖼️

Use ten frames to visualize teen numbers. A ten frame is a grid of ten squares. Fill one ten frame completely and then add extra ones in a second ten frame.

• Representation: To represent 16, fill one ten frame completely (10) and then put 6 counters in the second ten frame.
• Benefits: This clearly shows the 'ten and some more' structure of teen numbers.

Number Bonds 🔗

Introduce number bonds to show the relationship between the teen number, 10, and the remaining ones.

      13
     /  \
    10    3

• Explanation: Explain that 13 is made up of 10 and 3.
• Practice: Have your child draw number bonds for various teen numbers.

Relating to Addition ➕

Connect building teen numbers to addition. Show that a teen number is the sum of 10 and another number.

• Equation: 10 + 4 = 14
• Practice: Write addition equations for each teen number your child builds.

Games and Activities 🎉

Make learning fun by incorporating games and activities.

• Teen Number Bingo: Create bingo cards with teen numbers and call out "10 + [number]"
• Matching Game: Create cards with teen numbers and matching cards with their decomposition (e.g., 15 and 10 + 5).