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# 4th Grade Arithmetic & Algebra

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## Erick Garcia

on 6 January 2013

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#### Transcript of 4th Grade Arithmetic & Algebra

Math Rules Arithmetic and Pre-Algebra Algebra: Division Subtraction Multiplication Addition Adding & Subtracting: Adding is easy. When you have two or more numbers the order of the numbers does not matter. 981
+25 How to Subtract When solving addition algebra problems you do the OPPOSITE operation to get the answer. In addition, the position of the number does not matter. When solving subtraction algebra problems there
could be two possible ways to solve the problem. The
first involves adding(the opposite operation) the second
involves subtracting. When solving multiplication algebra problems, it does
not matter where the numbers are. You always do the opposite operation to solve the equation. Adding: How to Add Example: 5+5 = 10 7+2 = 9 The numbers can be switched
and the sum does not change 5+5 = 10 2+7 = 9 Adding Rules: Adding Vertically with More than one Digit 1006 1 1 regrouping: When adding, vertically, sometimes you must
"carry" a number to solve the problem. This means
that after you get the sum of the two numbers, you must
add the number you carried to the sum. 6781
+232 ???? 6781
+232 7013 1 1 Subtracting Subtracting is simple. However, you CANNOT switch
numbers. This will get you the wrong answer. 15-2= 13 Example: 25-15= 10 2-15= 13 15-25=10 NEVER switch the two numbers in
a subtraction problem. NEVER subtract a SMALL number from
a LARGER number. Subtracting Rules: Subtracting Vertically with More
than one Digit 502
-16 486 502
-16 4 9 1 1 "Borrowing" Since you CANNOT subtract a large
number from a smaller number, sometmes
you have to "borrow" a unit from the neighboring number to the left. 2000
- 19 1 9 9 1 1981 2000
- 19 ???? Arithmetic Math Rules 25+n=57 Example: think: 57-25 n=32 ANSWER: TRY IT : 57+f= 345 Think: 345-57= 288 f= 288 Example1 : 57-f = 10 Think: 57 -10= 47 Since you cannot subtract a larger number
from small number, that means the number
to the FAR LEFT is the LARGEST number. When the LAGEST number is given,
this means you must SUBTRACT to
solve the problem. f = 47 Example2: g-67= 25 Think: 25+67= 92 g = 92 When the number on the right of the equation is given,
you must do the opposite operation to solve the problem.
This means you must ADD. TRY THESE:
57-r= 25
w-25= 45 Think: Think: 57-25=32 r=32 45+25=70 w=70 Example: 5 x f = 45 Think: 45 / 5= 9 f = 9 TRY THIS: 8 x i = 48 Think: 48 / 8 = 6 i= 6 When solving division algebra problems, there are
two ways to solve it. By dividing or by multiplying (the
opposite). r /8= 48 60/y= 10
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