Mathemagics workbook 2-DIGIT SUBTRACTION

CHAPTER 2 LEFT TO RIGHTS  SUBTRACTION

LEFT TO RIGHTS SUBTRACTION

I hope you have finished Mathemagics workbook CHAPTER 1, here for most of us, it's easy to add rather than put. But if you follow the calculation from left to right and divide the problems into simpler components (using the simplification principle, as always), the subtraction can be as easy to add. maths tricks formulas  are also, help you to solve the 2 digit subtraction method

CHAPTER 2

2 DIGIT SUBTRACTION

Here in this Mathemagics workbook formula, we will see how to 2 digit subtraction works let’s see to extract two numbers, as an additional goal, your goal is to further simplify the problem until it is reduced to subtracting one number. Let's start with a very simple subtraction problem:

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After each step, a new and smaller subtraction problem is reached. Start by subtracting 86 - 20 = 66. Your problem becomes 66 - 5 = 61, now your final answer. The problem can be diagrammed in this Maths Tricks way:

Of course, subtraction problems are considerably easier when they do not involve loans. When they do, there are a number of strategies you can use to make them easier. For example:

There are two different ways to solve this problem mentally:

1.  You can simplify the problem by dividing 29 into 20 and 9, subtracting 20 and then subtracting 9:

2     You can treat 29 as 30 - 1, subtracting 30 and then adding 1 again:

Here is the Mathemagics workbook  rule to decide which method to use:

 If subtracting two numbers requires you to borrow a number, round the second number to a multiple of ten and add them difference again.

 For example,

Since this problem requires you to borrow, round off from 28 to 30, subtract and then add 2 again to get 26 as the final answer

Now test your hand on this 2-digit extraction problem:

Easy, right? Just round 37 to 40, subtract 40 from 81, which give you 41, and then add back the difference of 3 to get to 44, the final answer

In a short time you will feel comfortable working with subtraction problems in both directions. Just use the previous rule to decide which method will work best.

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 Exercises: 2-Digit Subtraction

3-DIGIT SUBTRACTION

In this Mathemagics workbook session we will learn about how to do Digit Subtraction.

Now let's test a 3 digits extraction problem:

This particular problem does not require you to borrow any number, so you should not find it so difficult. Simply subtract one digit at a time, simplifying as you go.

Now let's look at a 3-digit extraction problem that requires you to borrow a number:

At first glance, this probably seems like a pretty difficult problem, but if you round by 2, subtract 747 - 600 = 147, then add 2, you get to your final answer of 147 + 2 = 149.

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Try it now yourself: 

You rounded 692 to 700 and then subtracted 700 from 853? If you do, you've got 853-700 = 153. Since I put up more than 8, have you added 8 to become 161, the final answer?

Now, I admit that we make life easier for you by choosing numbers that you do not need to collect much. But what happens when it is not easy to know the amount of addition when you put a lot? The following 3-digit problem shows exactly what I mean:

If you subtract one number at a time while simplifying as you move, the sequence will look like this:

What happens if you reach 500?

It's easy to ask 500: 725 - 500 = 225. But you put up a lot. The small trick is to figure out exactly how much.

 At first glance Mathemagics workbook formula, the answer is far from clear. To find it, you need to know the distance from 468 to 500. The answer can be found using "Supplements", an elegant technique that will make many 3-digit extraction problems much easier.

 Use Complaints (Welcome!)

Quick, how many 100 of these numbers?

  

Here are the answers:

Note that for each pair of numbers that add to 100, add the first numbers (on the left) to the last 9 and the left (on the right) to 10. Say 43 are supplement 57, 32 compliments 68, etc. and so on.

You now find a complement to these two-digit numbers:

To find the 37 complement, first select what you need to add to 3 for 9. (The answer is 6.) Then select what you need to add to 7 to get 10. (The answer is 3.) Thus, 63 is your compliment.

Other supplements are 41, 7, 56, and 92. Note that, like everything you do as a sports doctor, supplements are selected from left to right. As we have seen, the first numbers are added to 9, while the second is added to 10. (Exceptions occur in numbers ending in 0 - for example, 30 + 70 = 100 - but complementary supplements are simple!)

What supplements have to do with psychosis? Well, it allows you to turn difficult subtraction issues into direct add-on issues. Let's think about the problem of the last proposition that has given us some problems:

To start, you can subtract 500 instead of 468 to reach 225 (725 - 500 = 225). But then, after subtracting a lot, you need to know how much that extra amount. Using the supplements gives you the answer in a flash. How much is 468 out of 500? The same distance as 68 is 100. If you take the supplementary number 68 in the way we showed you, it will be 32. Add 32 to 225 and reach 257, your final answer.

Try another 3-digit issue:

To calculate this mentally, subtract 300 from 821 to 521, and then add CMOS 59, which is 41, to reach 562, our final answer. The procedure is similar to this:

Here's another problem for you to try:

Check your answer and troubleshooting steps below:

When rounding, you can subtract 600 from 1246, leaving 646, then add the accessory 79 again, which is 21. Now you're final answer is 646 + 21 = 667.look how the maths tricks formulas are working!! Keep it up

Try the 3-digit subtraction exercises below, then create more exercises for your extra exercise (or should you be asking?).

Exercises: 3-Digit Subtraction

Answers can be found at the end of the Mathemagics workbook.

So how is going on with Maths Tricks!!! If you are not getting well Read! Read! And more Read! Until to know the fact of this Maths Tricks formulas, and do practical once you understand the maths tricks formulas then move ahead ok see you in the next Mathemagics workbook remaining session.

RELATED CHAPTER 1, CHAPTER 2, CHAPTER 3, CHAPTER 4, CHAPTER 5

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