K-5 friendly lesson
One small step at a time.Read the idea, try the activity, and celebrate each win as you go.
Use Models to Add 2-Digit Numbers (No Regrouping)
𧱠Let's stack the blocks! We can use picture models of Tens-Rods and Ones-Cubes to actually SEE the addition happening on the paper.
Do this: Read the concept below, then try the quiz or activity.
Lesson 44 of 186
Concept
When we first start stacking numbers on top of each other, seeing them as blocks makes it click in your brain perfectly.
π― The Block Stacking Rules:
Example: 24 + 31 = ?
1. Draw the top number: Draw 2 Tens-Rods (long lines) and 4 Ones-Cubes (little dots).
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2. Draw the bottom number UNDER it: Draw 3 Tens-Rods and 1 Ones-Cube below the others.
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3. Count the Ones FIRST: Look at the dots. You have 4 and 1. That's 5 ones!
4. Count the Tens SECOND: Look at the long lines. You have 2 and 3. That's 5 tens!
5. The Answer: 5 tens and 5 ones makes 55!Try it
Stack the blocks!
Instructions: Look at the base-ten blocks (or draw them!) to find the answer.
Problem 1: Top row: 3 Tens, 2 Ones Bottom row: 4 Tens, 5 Ones * Add the ones: 2 + 5 = ___ * Add the tens: 3 + 4 = ___ * Answer: ___
Problem 2: Top row: 5 Tens, 1 One Bottom row: 2 Tens, 8 Ones * Add the ones: ___ * Add the tens: ___ * Answer: ___
Problem 3: 44 + 53 = ? * Answer: ___
Problem 4: 16 + 22 = ? * Answer: ___