Add 3-Digit Numbers with Models (No Regrouping)
š§± Welcome to the Big City! It's time to draw Flats, Rods, and Cubes to stack three giant columns of blocks together.
Concept
We stacked tens and ones blocks before. Now we just add the giant square Flats to the far left! šÆ **The "Triple Stack" Method:** **Example: 234 + 152 = ?** 1. **Draw the starting number (234):** * Hundreds: Draw 2 giant squares. * Tens: Draw 3 long rods. * Ones: Draw 4 tiny dots. 2. **Draw the second number underneath (152):** * Hundreds: 1 giant square. * Tens: 5 long rods. * Ones: 2 tiny dots. 3. **Count the columns! (RIGHT TO LEFT!)** * Count Ones dots: 4 + 2 = 6 ones. * Count Tens rods: 3 + 5 = 8 tens. * Count Hundreds squares: 2 + 1 = 3 hundreds. 4. **Answer:** **386**. The blocks make it impossible to get lost.
Try it
Build the giant skyline! **Instructions:** Imagine the Giant squares (100), Long rods (10), and Tiny cubes (1). Count them column by column to find the answer. **Problem 1: 415 + 243 = ?** * Squares: 4 + 2 = ___ * Rods: 1 + 4 = ___ * Cubes: 5 + 3 = ___ * Answer: ___ **Problem 2: 152 + 524 = ?** * Squares: ___ * Rods: ___ * Cubes: ___ * Answer: ___ **Problem 3:** You see a picture: Top row has 3 squares, 0 rods, 6 cubes. Bottom row has 1 square, 4 rods, 2 cubes. * Answer: ___ **Problem 4:** 500 + 192 = ? * (Hint: The top number only has squares!) * Answer: ___