--- title: "Subtracting multiples of 10" description: "Subtract multiples of 10 (10–90) from multiples of 10 using place value strategies" canonical: https://lightmysky.com/learn/mathematics/subtracting-multiples-of-10-mt_HJTuIGHvcR source: https://lightmysky.com/learn/mathematics/subtracting-multiples-of-10-mt_HJTuIGHvcR.md retrieved: 2026-10-19 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Subtracting multiples of 10 Subtract multiples of 10 (10–90) from multiples of 10 using place value strategies Subject: Mathematics · Area: Addition & Subtraction · Ages 6 to 7 Page: https://lightmysky.com/learn/mathematics/subtracting-multiples-of-10-mt_HJTuIGHvcR ## Ready when they can - Calculate 70 − 30 = 40 - Use base-ten blocks to show 80 − 50 = 30 - Explain that subtracting tens is like subtracting the tens digits ## Lesson: Taking away tens A multiple of 10 is made of whole groups of ten. When you subtract two multiples of 10, you are really taking away some of those groups. You already know how to subtract small numbers, so use that same skill on the tens. *(drawing: Start at 70. Hop back 3 tens, one ten at a time, and land on 40.)* **Example.** Ben has 60 marbles. He gives 20 marbles to his friend. Think: 6 tens take away 2 tens is 4 tens, so 60 minus 20 is 40. **Tip.** Look at just the tens digits. For 70 minus 30, think 7 minus 3 equals 4. Then put the zero back: the answer is 40, not 4. **Recap.** To subtract tens, subtract the tens digits, then put the zero back on. ## Practice 18 questions on this page, each with its working shown. ## Needs first - [The multiples of 10](https://lightmysky.com/learn/mathematics/the-multiples-of-10-mt_zfy1gOEewd) - [Subtraction as taking away or separating](https://lightmysky.com/learn/mathematics/subtraction-as-taking-away-or-separating-mt_zuKAX6lcYR)