Multiply 2 digit numbers in head @Brainathlete

Uploaded September 2026 | Updated September 2026, 1 week ago

Ron White, 2x USA Memory Champion shares how to do a mental math trick of multiplying 2 digit numbers in your head.

Multiply 2 digit numbers in your head

You can multiply 2 digit numbers in your head as long as one of them is even with this trick.

1. Divide the number that's even by 2
2. Double the other
3. Multiply them together

So 18 X 25
1. 18/2 = 9
2. 25 x 2 = 50
3. 9 x 50 = 450

reducing the even number to a smaller numeral often makes it easier to do the math in your head. Give it a try.

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$Understanding Multiplication Tables is MOST Important Understanding the multiplication tables, rather than just memorizing them, is crucial for several reasons, especially in fostering a solid mathematical foundation and promoting long-term skills in problem solving and critical thinking. Here are some key reasons why understanding is more important: ### 1. **Foundation for Higher Math** A deep understanding of multiplication tables sets the stage for higher mathematical concepts like division, fractions, algebra, and beyond. When students understand how these numbers interact, they can more easily grasp more complex operations and mathematical theories. ### 2. **Flexibility in Problem Solving** Understanding multiplication allows students to think flexibly about numbers and operations. For example, if a student understands that (5 times 7) is the same as (5 + 5 + 5 + 5 + 5 + 5 + 5), they can apply this understanding to break down more complicated problems into manageable parts, a strategy useful in mental math and algebraic manipulation. ### 3. **Prevents Rote Learning Limitations** Memorization without understanding can lead to difficulties when students encounter unfamiliar problems or need to apply their knowledge in different contexts. Students who understand the principles behind the multiplication tables can adapt their knowledge to new situations without being reliant on recalling specific facts. ### 4. **Builds Numerical Literacy** Understanding the relationships between numbers helps in developing numerical literacy. Students become capable of recognizing patterns and sequences in numbers, enhancing their ability to make predictions and understand numerical data in real-world contexts, like statistics and probability. ### 5. **Encourages Mathematical Confidence and Curiosity** When students understand how multiplication works, they are more likely to feel confident in their mathematical abilities. This confidence can lead to greater curiosity and a willingness to engage with more challenging mathematical concepts. ### 6. **Improves Memory Retention** Understanding aids memory. When students know why a multiplication fact is true, theyre more likely to remember it. For instance, understanding that multiplying by ten always adds a zero in the base-ten number system helps students remember any multiplication involving tens. ### 7. **Facilitates Error Checking and Correction** With a strong understanding, students can check their work for errors and understand where they might have gone wrong. If a student relies solely on memory, they might not recognize their errors or understand how to correct them without revisiting the multiplication tables. ### 8. **Promotes Lifelong Learning** In the broader scope of lifelong learning, understanding foundational concepts like multiplication encourages a mindset of inquiry and comprehension, rather than rote repetition. This mindset can be beneficial in all areas of learning and problem-solving throughout life. Ultimately, while memorization can be a helpful tool for quick recall, it is the understanding of multiplication that empowers students to use mathematics effectively and confidently in both academic settings and everyday life.$

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Multiply 2 digit numbers in head