十位数字相同，个位数字的和等于10的两个两位数相乘，可迅速写出其结果．方法是：个位上的两个数字的乘积放在结果的个位和十位上（积是一位数则十位上享零），十位上相同的数字乘以比它大1的数的8放在结果的百位（或百位和千位上），即为最方结果．例如，对24X26，它们的十位 The ten digits are the same, and the two digits with the sum of the digits of the digit equal to 10 are multiplied to quickly write the result. The method is: the product of two digits on one bit is placed on the result’s place and ten digits (the product is a single digit and the ten digits are zeroed), and the same number on ten digits is multiplied by a one digit greater than it. 8 is placed in the hundred (or hundreds and thousands) of the result, which is the most square result. For example, for 24X26, their tens