Transcript egyptian multiplication

Egyptian Multiplication
The Ancient Egyptians used a pencil and paper
method for multiplication which was based on
doubling and addition.
18 x 53 using Egyptian Multiplication
Write 1 and 53, meaning 1 lot of 53.
Work down, doubling the numbers, so
that you’ve now got 2, 4, 8, 16, etc.
lots of 53.
Stop when the number of the left (16)
is more than half of the other number
you are multiplying (18).
Look for numbers on the left that add
up to 18 (2 and 16).
Cross out the other rows of numbers.
Add up the remaining numbers on the
right to get the final answer.
1
2
4
8
16
53
106
212
424
848
954
76 x 39 using Egyptian Multiplication
Write 1 and 76, meaning 1 lot of 76.
Work down, doubling the numbers, so
that you’ve now got 2, 4, 8, 16, etc.
lots of 76.
Stop when the number of the left (32)
is more than half of the other number
you are multiplying (39).
Look for numbers on the left that add
up to 39 (1, 2, 4 and 32).
1
2
4
8
16
32
76
152
304
608
1216
2432
Cross out the other rows of numbers.
Add up the remaining numbers on the
right to get the final answer.
2964
Now it’s your turn!
This jar holds 17 litres of water.
How much water will 26 jars hold?
A potter makes 35 pots each week.
How many will he make in a year?
This chariot travels 23km in an hour.
How far will it travel in 45 hours?
Now it’s your turn!
A soldier marches 28km each day.
How far will he march in 38 days?
A chest holds 44 large gold coins.
How many coins will 35 chests hold?
This boat carries 61 soldiers.
How many soldiers are there on 26
boats?
END OF PRESENTATION