10 more, 10 less, 100 more, 100 less
place value · Mentally finding 10 more, 10 less, 100 more, and 100 less
For your first or second grade class this is a great way to get their mental juices going.
10 more, 10 less, 100 more, 100 less is a Grade 1–2 place value routine built around mental math. The teacher gives a number and students determine numbers that are 10 or 100 greater or less, gradually moving into three-digit numbers. Saying the starting number aloud instead of writing it adds another useful layer because students must hold the number in mind while changing its place value.
Use this as a whole-class warm-up, quick review, or recurring place value routine when you want students reasoning mentally instead of relying on a calculator or written algorithm. A free Find a Math Game account can generate teacher-ready lesson support for 10 more, 10 less, 100 more, 100 less. No credit card is needed, with 3 lifetime lesson generations included.
- Grades:
- 1, 2
- Materials:
- paper, printable
- Classroom use:
- whole class
Standards alignment
Official Rules
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