Use number lines to add three-digit numbers
🐸 Time for some huge leaps! Adding three-digit numbers is easy when you see them on an open number line.
Do this: Read the concept below, then try the quiz or activity.
Concept
A number line isn't just for small numbers. You can use an "open number line" to jump by hundreds, tens, and ones!
🎯 How to Add on a Number Line: Example: 245 + 132 = ? 1. Start with the biggest number on the left side of your line: 245. 2. Break apart the second number (132). It has 1 hundred, 3 tens, and 2 ones. 3. Take a HUGE hundreds jump: Jump +100 from 245. You land at 345. 4. Take three tens jumps: Jump +10, +10, +10 from 345. (355, 365, 375). 5. Take two tiny ones jumps: Jump +1, +1 from 375. (376, 377). 6. Your final landing spot is the answer! So, 245 + 132 = 377.
Try it
Make big jumps to solve these problems!
Instructions: Imagine the big jumps on a number line to find the sum.
Problem 1: 400 + 250 * Start at 400. Jump 2 hundreds (500, 600) and 5 tens. * Answer: ___
Problem 2: 310 + 104 * Start at 310. Jump 1 hundred and 4 ones. * Answer: ___
Problem 3: 125 + 125 * Answer: ___
Problem 4: 550 + 212 * Answer: ___