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Numbers up to 2-Digits. In 2-digit numbers, there are only two place values - the units place and the tens place. Every number which has more than 1-digit has different digits described by their place values. 2-digit numbers start from 10 and end on 99. In other words, the smallest 2-digit number is 10 and the greatest 2-digit number is 99.
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- Calculating Double Digits by Double Digits. Download Article 1 Write the double-digit numbers on top of each other. Place 1 of the double-digit numbers on top and the other double-digit number directly below it.
- Carrying Results. Download Article 1 Multiply and carry results that are larger than 9. If you multiply the ones place number and the result is larger than 9, you'll need to carry the extra value above the top number.
- Practice Problems and Answers. Sample Double Digit Multiplication Practice Problems and Answers. Community Q&A. Search. Add New Question. Question. Should I always add zero in the second column?
Example: Multiply 23 × 2. Step 1: Place the one-digit number below the 2-digit number. This makes the one-digit number the multiplier. Multiply the one-digit number (the multiplier) with the ones digit of the multiplicand. Here, 2 is the multiplier and the ones digit of the multiplicand is 3. So, 2 × 3 = 6.
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- 11 min
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- Khan Academy
Then we would have figured out that 36 times 2 is 72, but this 2 isn't just a 2. This is a 20. So 36 times 20 is 720. And now we can add these two things because 36 times 27 is the same thing as 36 times 20 plus 36 times 7. So let's add these two numbers together. 2 plus 0 is 2. 5 plus 2 is 7. 2 plus 7 is 9.
- 4 min
- Sal Khan
Sep 11, 2015 · The trick here to remember your place value as you multiply and then add the numbers. We'll demonstrate and make it perfectly clear!Practice this lesson your...
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- Khan Academy
There is a Vedic math trick for multiplying any multi-digit numbers, called vertical and crosswise. For example, let’s use this trick on the last problem in the lesson, 523 x 798. Multiply the first digits: 5 x 7 = 35. This represents 35 ten-thousands. Cross multiply the first two digits by the first two digits: (5x9)+ (2x7) = 45+14 = 59.
- 10 min
- Sal Khan
