Pascal
I will say it was the pascaline, created by Blaise Pascal in 1642. It was a mechanical calculator that could add and subtract directly.
Finally completed in 1694 the Leibnitz calculator can add,subtract,multiply, and divide numbers. The stepped drum principle of Gottfried Leibnitz's invention survived for 300 years.
An Abacus is a device to help do math.It is basically a frame with rods and beads in the rods.One rod will represent ones,the next tens, then hundreds,then thousands.You move the beads up when you want to add and down when you want to subtract.
That time is using a 24 hour clock instead of a 12 hour, so 1pm is 1300, to figure any time out past 12, subtract 12 from it and add pm 1900=7:00pm
Subtract and add the sign of the greater number.
You have to add the additive inverse. To subtract q, you add -q.
-5+-3 = -8 ++ Add -- Add +- Subtract -+ Subtract
Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.Any four-digit number will do. Add it to the number 33333, to get the original number you have to subtract from.
If the number has a + sign then you add it, if it has a - sign, then you subtract it.
Abacus
The inverse operation for subtract 5 is add 5. This is because whatever number you start with, if you first "subtract 5" and then "add 5" or if you first "add 5" and then "subtract 5" you are back to the number you started with.
Number. You need a number.
Leibniz's calculator could multiply and divide as well as add and subtract. The pascaline calculator could only add and subtract.
Yes.
If you want to use a number line to add and subtract, it can be done with a slide rule. But it is much easier to use an electronic calculator.
wich one