1.NBT.C.5 — Free Activities & Worksheets
Free Common Core 1.NBT.C.5 activities and worksheets for Grade 1, aligned to the Number & Operations in Base Ten strand. Browser-playable interactive exercises plus printable PDFs, available in all 11 supported languages — no signup, no paywall.
Grade 1·Number & Operations in Base Ten·1.NBT.C.5
Interactive activities
Grade 1·1.NBT.C.5
Ten More, Ten Less — Mental Math With Two-Digit Numbers
Find 10 more or 10 less than a two-digit number — all in your head. Look at the tens: only the tens digit changes, so there is no counting. Tap the number you think is right, and take all the time you need. A calm way to build place-value sense and mental math, aligned to Common Core 1.NBT.C.5 — mentally finding 10 more or 10 less than a two-digit number without having to count.
Try itRelated standards in 1.NBT
Frequently asked questions
- What is covered under 1.NBT.C.5?
- 1.NBT.C.5 sits in the Number & Operations in Base Ten strand for Grade 1. This page gathers the free interactive activities and worksheets aligned to it.
- Are these 1.NBT.C.5 resources free?
- Yes. Every activity and worksheet aligned to 1.NBT.C.5 is free to use online and to print — no signup and no paywall.
- Who are these 1.NBT.C.5 activities for?
- They are built for Grade 1 teachers and learners following the Common Core Number & Operations in Base Ten progression, and work for class, small-group, or home practice.