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First, subtract 20 and 5. Then take that answer and subtract 13 from it. 20-5-13 15-13 2 The answer is 2
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Subtract 4 each time.
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The rule is: add 5, subtract 2, add 5, subtract 2, . . . Next number is 24.
First, subtract 20 and 5. Then take that answer and subtract 13 from it. 20-5-13 15-13 2 The answer is 2
Subtract 4 each time.
The rule is: add 5, subtract 2, add 5, subtract 2, . . . Next number is 24.
Using algebra the number works out as 25
if you subtract 0 from 5 is still 5. but if you subtract 5 from 0 then it would be -5.
Subtract 3x from each side: 4x - 2 + 13 = 5 Add 2 to each side: 4x + 13 = 7 Subtract 13 from each side: 4x = -6 Divide each side by 4: x = -1½ Job done.
Multiply by four and then subtract three.
-13 is the number must you subtract from -13 to get a difference of 0
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You subtract as with base ten, except that instead of "borrowing" 10 from the column on the left, you borrow 8.So assume all number below are in base 8.3 5- 1 6--------You cannot subtract 6 from 5 so you need to borrow.2313- 1 6--------where the 13 is the borrowed 8 plus the 5 that was already there..13-6 = 7and 2-1 = 1so the answer is 17.You subtract as with base ten, except that instead of "borrowing" 10 from the column on the left, you borrow 8.So assume all number below are in base 8.3 5- 1 6--------You cannot subtract 6 from 5 so you need to borrow.2313- 1 6--------where the 13 is the borrowed 8 plus the 5 that was already there..13-6 = 7and 2-1 = 1so the answer is 17.You subtract as with base ten, except that instead of "borrowing" 10 from the column on the left, you borrow 8.So assume all number below are in base 8.3 5- 1 6--------You cannot subtract 6 from 5 so you need to borrow.2313- 1 6--------where the 13 is the borrowed 8 plus the 5 that was already there..13-6 = 7and 2-1 = 1so the answer is 17.You subtract as with base ten, except that instead of "borrowing" 10 from the column on the left, you borrow 8.So assume all number below are in base 8.3 5- 1 6--------You cannot subtract 6 from 5 so you need to borrow.2313- 1 6--------where the 13 is the borrowed 8 plus the 5 that was already there..13-6 = 7and 2-1 = 1so the answer is 17.
18. The pattern is add 5, then subtract 1.
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