K-5 friendly lesson
One small step at a time.Read the idea, try the activity, and celebrate each win as you go.
Add THREE 2-Digit Numbers
ποΈ Welcome to the towering math stack! When you have three giant numbers on top of each other, you have to be extra careful adding down the column.
Do this: Read the concept below, then try the quiz or activity.
Lesson 52 of 186
Concept
Stacking three numbers follows the exact same rules! There are just more things to add in the column.
π― The Tower Strategy: Example: 2 4 3 5 + 1 6 --------- 1. The Ones Column: (4 + 5 + 6). *Use your ninja tricks! I see a 4 and a 6. That "makes 10". 10 + 5 is 15!* 2. Regroup! The answer 15 is too big! * Write the 5 at the bottom. * Carry the 1 ten all the way to the top of the tens column! 3. The Tens Column: (1 + 2 + 3 + 1). * 1+2=3. 3+3=6. 6+1=7. * Write the 7. 4. Answer: 75!
It isn't harder, it's just a slightly longer path to the answer.
Try it
Climb the math tower!
Instructions: Add down the massive Ones column first. Carry the extra ten! Then add down the massive Tens column.
Problem 1: (+1) 3 2 1 9 + 2 1 --------- * Ones column: 2 + 9 + 1 = 12. (Write 2, carry 1). * Tens column: 1 + 3 + 1 + 2 = ___ * Total Answer: ___
Problem 2: 4 5 2 0 + 1 8 --------- * Answer: ___
Problem 3: 1 7 5 2 + 2 3 --------- * (Hint: Make a 10 in the Ones column! 7+3!) * Answer: ___
Problem 4: 2 2 3 3 + 4 4 --------- * Answer: ___