Can you give an example of how to calculate an integer orally, how to multiply an integer by one digit, and how to multiply two digits by one digit (without carrying)?

Multiply an integer by a number and add one or two zeros directly after a number. Two digits are multiplied by one digit without carrying, and two digits are multiplied by one digit.

12×2

13×9

16×7

17×8

24×9

1 1×4

23×7

29×8

44×5

Integer multiplication algorithm for extended data;

(1) number alignment. Starting from the right, multiply the first factor by the number on each bit of the second factor, and the end of the number will be aligned with which bit of the second factor.

(2) Then add up the numbers multiplied several times.

(Multiply with 0 at the end of an integer: you can multiply the number before 0 first, then see how many zeros are at the end of each factor, and add a few zeros at the end of the multiplied number. )