How do you calculate 86 18 s mental arithmetic?

If you want to do mental arithmetic calculations here, you can do it by subtraction, which is relatively easy to calculate.

Vertical 86-18 calculations.

Problem solving ideas: align the subtraction with the subtracted number, subtract the number from the corresponding counting unit respectively, if it is not enough to subtract, you need to borrow 1 from the high position, and calculate the result in turn, the subtraction is less than the subtracted number, and the final result of the two numbers will be converted and subtracted by adding a negative sign; The decimal part is subtracted by referring to the integer subtraction step;

Problem solving process: Step 1: 16-8=8 Borrow 1 from the high position Step 2: 8-1-1=6

According to the above calculation steps, the combined calculation result is: 68

If you have any doubts, please ask and be satisfied.

86-18, first subtract from the single digit, 6-8 is not enough, use ten to subtract, 10-8 = 2, 2 + 6 = 8, that is to say, the single digit of the result is 8, and then subtract ten, just now I have borrowed one, so now I want to subtract one, so it is 7-1, 7-1 = 6, and it is six on the dozens of digits, and eight on the single digit, then the result is 68

So through the above calculation, the answer is 68

I will calculate the first one, 70 + 16 = 86, and then the difference between 16 and 18 is 2 70 and then minus 2 equals 68, so the final result is equal to 68

You can start by thinking of 18 as 20-2.

Calculation through simple algorithms is also a mental calculation process.

The above is the whole process of the calculation of the formula, if it is helpful.

86-20+2 equals 66+2 equals 68

It's simple.

18+81+99 99 how to calculate.

I'm glad to answer for you, you can calculate it like this: the original formula is equal to 99 + 99 * 99 = 99 * (1 + 99) = 99 * 100 = 9900

The inverse operation is generally used for the design. Addition is checked by subtraction, and subtraction is checked by addition.

78 dec. 18 = 96

Check: 96-18=78

The inverse operation is generally used for the design. Addition is checked by subtraction, and subtraction is checked by addition. Multiplication is checked by division, and division is checked by multiplication.

78 dec. 18 = 96

Difficulty Checking and Calculating: Method 1.

Method 2: or.

Method 3: Use the ridge calculator Wang Weiyu.

Method 1: Tell the Emperor.

Method 2: or.

According to the algorithm first multiplication, then subtraction, first multiplication: 8 7 equals 56, then subtraction: 86-56 equals 30

Multiplication first, 8 7 = 56, then subtraction, 86-56 equals 30

82*18=1476, you can use 1476 82=18, or 1476 18=82. Look

Analysis: 82 18 82 (20-2) 82 20-82 2 1640-82 2 1640-164 1476.

From this, it can be seen that the answer here is correct.

Taken together, we can see that this equation examines our splitting of numbers.

Of course, for this problem, you can also use the column-vertical check.