Constant Difference
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Constant Difference Strategy for Subtraction
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Have you heard of the -1 strategy also known as constant difference? Why it works: Since you subtract 1 from both numbers, the difference remains the same. Ways to use: 1. As a way for students to check their regrouping work 2. Another math strategy to add to their tool kit Let me know what other math strategy you want to see in action 💕👇🏽 | Yourteacherbestie
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Have you heard of the -1 strategy also known as constant difference? Why it works: Since you subtract 1 from both numbers, the difference remains the same. Ways to use: 1. As a way for students to check their regrouping work 2. Another math strategy to add to their tool kit Let me know what other math strategy you want to see in action 💕👇🏽 | Yourteacherbestie
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31: Using a Constant Difference to Subtract
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𝐕𝐞𝐥𝐜𝐤𝐢𝐬 | Elementary Math on Instagram: "Have you heard of the -1 strategy also known as constant difference ? Why it works: Since you subtracted 1 from both numbers, the difference remains the same. Let me know what other math strategy you want to see in action 🩵 #iteachthird #iteachsecond #elementarymath"
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Same difference, or constant difference is a must teach subtraction strategy for grade 3 and up. This makes subtraction problems simple to solve mentally and can eliminate so much of the error that comes with the standard algorithm and regrouping. It also helps develop number sense! Try it with your students and let me know how it goes! #mentalmath #subtractionstrategies #mentalmathskills #samedifference #constantdifference #subtraction #mentalmathforkids | Teaching Resources by Shelley Gray
382 viewsOct 13, 2025
FacebookTeaching Resources by Shelley Gray
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Simplifying Subtraction with Constant Difference
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