100 More, 100 Less

Find 100 more or less, and notice which digit changes.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 18

Here's 246 in blocks: 2 hundreds, 4 tens, and 6 ones.
Add one more hundred. Now there are 3 hundreds. 100 more than 246 is 346!
Look at the chart. Only the hundreds digit changed, from 2 to 3. The tens and ones stayed the same.
100 less works the same way, backward. 100 less than 781 is 681.
Your turn! Use the buttons to build 100 more than 425.
525! Remember: 10 more or less changes the tens digit. 100 more or less changes the hundreds digit.

Georgia's K-12 Mathematics Standards:

2.NR.2.2 — Find 10 more or 10 less than a given three-digit number and find 100 more or 100 less than a given three-digit number.