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Doubles Minus 1: Definition and Example | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">Doubles Minus 1Doubles Minus 1: Definition and ExampleTable of ContentsDefinition of Doubles Minus 1 Strategy

The doubles minus one strategy is a mental math technique that helps us quickly add two consecutive numbers. This approach leverages our knowledge of doubles facts (adding a number to itself) to solve addition problems efficiently. When we double a number, we add it to itself (like 6+6=126 + 6 = 126+6=12), and the result is always an even number. The doubles minus one strategy builds upon this concept by using the double of the larger number and then subtracting one to find the sum of two consecutive numbers.

There are distinct differences between related addition strategies. While doubles facts involve adding a number to itself (like 7+77 + 77+7), the doubles minus one strategy specifically helps us find the sum of two consecutive numbers where one number is one less than the other (like 7+67 + 67+6). Similarly, it differs from the doubles plus one strategy, which is used when one number is one more than the other. These near doubles strategies provide efficient mental math shortcuts for solving addition problems involving consecutive numbers.

Examples of Doubles Minus 1 Strategy Example 1: Finding 4+34 + 34+3 Using Doubles Minus 1 Problem:

Use the fact that 4+4=84 + 4 = 84+4=8 to find 4+34 + 34+3.

Step-by-step solution: Step 1, recognize that 333 is one less than 444, making this a perfect scenario for the doubles minus one strategy. Step 2, recall the doubles fact: 4+4=84 + 4 = 84+4=8. This is our starting point. Step 3, since 333 is one less than 4, we know that 4+34 + 34+3 will be one less than 4+44 + 44+4. Step 4, subtract 111 from the doubles fact result: 4+3=(4+4)−1=8−1=74 + 3 = (4 + 4) - 1 = 8 - 1 = 74+3=(4+4)−1=8−1=7 Example 2: Completing an Equation with Doubles Minus 1 Problem:

Find the missing number: 12+11=12+12−?12 + 11 = 12 + 12 - \text{?}12+11=12+12−?

Step-by-step solution: Step 1, identify that we're working with the consecutive numbers 121212 and 111111, where 111111 is one less than 121212. Step 2, apply the doubles minus one strategy. We can rewrite 12+1112 + 1112+11 as (12+12)−1(12 + 12) - 1(12+12)−1. Step 3, recognize that the missing number in the equation 12+11=12+12−?12 + 11 = 12 + 12 - \text{?}12+11=12+12−? must be 111. Step 4, therefore, the missing number is 111. Example 3: Solving a Word Problem with Doubles Minus 1 Problem:

777 ducks were swimming in a pond. 666 more ducks joined them. How many ducks are in the pond now?

Step-by-step solution: Step 1, translate this word problem into a math equation: 7+67 + 67+6 will give us the total number of ducks. Step 2, notice that 666 is one less than 777, making this suitable for the doubles minus one strategy. Step 3, use the doubles fact: 7+7=147 + 7 = 147+7=14. This will be our reference point. Step 4, apply the doubles minus one strategy: Since 7+67 + 67+6 is one less than 7+77 + 77+7, we calculate 7+6=(7+7)−1=14−1=137 + 6 = (7 + 7) - 1 = 14 - 1 = 137+6=(7+7)−1=14−1=13. Step 5, therefore, there are 131313 ducks in the pond now. Comments(7)AAnglerHarryNovember 4, 2025I've used the doubles minus 1 strategy with my students. It's a great way to make addition fun and easier for them to grasp!

MCMs. CarterSeptember 17, 2025I’ve been using the doubles minus 1 strategy with my students, and it’s been a game changer! They’re grasping addition so much faster now. The examples on this site made it super easy to explain. Thanks!

MCMs. CarterSeptember 9, 2025I’ve been teaching my students the doubles minus 1 strategy, and this definition made it so easy to explain! The examples were super helpful—we even turned it into a fun game during class. Thanks for this resource!

NNatureLover85August 27, 2025I’ve used the Doubles Minus 1 strategy with my students, and it’s made learning addition so much easier for them! The examples on EDU.COM really helped me explain it clearly. Highly recommend!

MCMs. CarterAugust 20, 2025I’ve been using the Doubles Minus 1 strategy with my kids, and it’s made mental math so much easier for them! The examples on the site were super helpful for explaining it clearly.

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