674x101-674 force off formula calculation

1. This problem can be simplified by using the nature of subtraction. A - (B + C) = a-b-c, the simple calculation process is as follows
674 - (210 + 374)
= 647-210-374
= 674-374-210
= 300-210
= 90

2. (82 × 12-674) ÷ 13 off formula calculation
(82 × 12-674) ÷ 13
=984-674/13
=310/13
≈24

3. This is a four mixed operation problem. We should do multiplication and division first and then add and subtract in accordance with the operation order

4. 101x101-101
= 101x (101-1)
= 101x100
= 10100
the above is a simple process

5. 解：39X101
=39X(100十1)
=3900十39
=3939

6. (674-438) x18
=236×18
=4248

7. How to calculate 12.6x101-12.6 with off type
12.6x101-12.6
= 12.6 * (101-1)
= 12.6 * 100
= 1260

8. =0.8 ×( 101-1)
=0.8 × More than 100
= 80 is a simple calculation process.

9. 365X101-365
=365X100+1-365
=36500-365+365
=36500

10. = 89X(100+1)
= 89X100+89X1
= 8900+89
= 8989