1、 123×45=5535
2、234×56= 13 104
3、345×67=23025
4、456×78=35768
5、567×89=49323
6、678×90=6 1020
7、789×87=68367
8、2 13×45=9585
9、324×56= 18096
10、435×67=29055
1 1、546×78=43098
12、657×89=58677
13、768×90=69 120
14、879×88=78472
15、2 1 1×45=9495
16、322×56= 18392
17、434×67=29078
18、545×78=42630
19、656×89=58584
20、767×90=69090
2 1、878×87=76806
22、30 1×45= 13545
23、302×56= 1686
24、50 1×63=3 1563
25、502×74=37 148
26、503×85=42725
27、6 18× 1 1=686
28、627×22= 14094
29、68 1×33=22473
30、645×44=28580
3 1、678×55=37390
32、639×66=427 14
33、692×77=53764
34、60 1×88=52888
35、657×99=65043
36、698× 1 1=7678
37、642×22= 14 124
38、6 17×33=2024 1
39、638×44=28392
40、689×55=37895
Fast calculation skills of multiplying three digits by two digits
1. Multiply the single digits of these two numbers first, and take the single digits of the product as the last digit of the result. If there is a decimal number, keep it in mind.
2. Cross multiply the ten digits of these two numbers, add the product, add the decimal digits of the first step to get a new two-digit number, take one digit as the penultimate digit of the result, and keep the ten digits in mind.
3. Cross-multiply this number by hundreds, multiply by tens, add three products, add one digit to get a new two-digit number, take one digit as the penultimate digit of the result, and record the ten digits as decimals.
4. Cross-multiply the hundreds and tens of these two numbers, add the product with the digits of the previous one, take the digits of the new two as the fourth last digit of the result, and keep the digits in your mind.
This number is multiplied by 100, and the product is multiplied by one digit. Each digit is connected with the two digits used as the result, which is the result of the multiplication of these two digits.
The above contents refer to Baidu Encyclopedia-Multiplication.