“If you want to know how fast computers can solve certain mathematical problems, then integer multiplication pops up as some kind of basic building brick with respect to which you can express those kinds of speeds.” Most everyone learns to multiply the same way.

We stack two numbers, multiply every digit in the bottom number by every digit in the top number, and do addition at the end.

Mental math works great for four of the six operations of math: addition (4 4=8), subtraction (8-4=4), multiplication (4x2=8), and division (8/4=2). To solve this problem first we identify all the numbers and the operations that will be used.

These four operations can be used to solve any math problem. Let's imagine you and your best friend are heading on a road trip. While on the highway, there are a total of seven cars in your lane. We know that we start with seven cars and three leave. Our problem is this: 7 cars in the lane - 3 cars that leave= 4 cars left in the lane Now we have to add the seven cars to our lane, because they joined us.

If you’re multiplying two two-digit numbers, you end up performing four smaller multiplications to produce a final product.

The grade school or “carrying” method requires about is the number of digits of each of the numbers you’re multiplying.So three-digit numbers require nine multiplications, while 100-digit numbers require 10,000 multiplications.The carrying method works well for numbers with just a few digits, but it bogs down when we’re multiplying numbers with millions or billions of digits (which is what computers do to accurately calculate pi or as part of the worldwide search for large primes).You also have to share the costs of gas with your friend. You can visualize what the problem is asking you when you use mental math.The four operations used in math are addition, subtraction, multiplication, and division.The word joined indicates addition: 4 cars in the lane 7 cars that joined= 11 cars in total To solve this problem, first we subtracted the cars that left and then added the cars that joined.We can also solve the problem this way: 7 cars in the lane 7 cars that joined= 14 cars 14 cars - 3 cars that left= 11 cars in total The answer is the same even though we solved the problem two different ways.“Everybody thinks basically that the method you learn in school is the best one, but in fact it’s an active area of research,” said Joris van der Hoeven, a mathematician at the French National Center for Scientific Research and one of the co-authors.The complexity of many computational problems, from calculating new digits of pi to finding large prime numbers, boils down to the speed of multiplication., or If I eat four slices of pizza tonight, will I have enough for lunch tomorrow?Using mental math to solve two-step word problems can be easy and very useful in everyday life, and you might not even know it.

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