1. Russian multiplication
74 x 45
Here is how the russians used to multiply. 37 90
First write the calculation with the largest number first 18
180
Half the first number ignore any remainder 9
360
Double the second number 4
720
Repeat this process 2
1440
Stop when the left hand number reaches 1 1
2880

2. Russian multiplication
74 x 45
The next step is to cross out any even numbers in the left hand column 37 90 18
180
Then cross out opposite numbers in the right hand column 9
360 4
720 2
1440 1
2880

3. Russian multiplication
Add the remaining numbers in the right hand column
74 x 45 37 90 90 18
180
360 9
360 +
2880 4
720 3 3 3 2
1440 1 2 1
2880
Finished 74 x =

4. Russian multiplication
Now try one for yourself, try to keep ahead of the example
57 x 38 38 28 76
304 14
152
608 7
304 +
1216 3
608 2 1 6 6 1
1216 1 2
Finished 57 x =

5. Russian multiplication
Try these calculations, check your answers with a friend to correct any mistakes
75 x 19 =
79 x 36 =
51 x 29 =
92 x 57 =
47 x 74 =
1425
2904
7479
5244
3478