Math Addition, Subtraction, Division, Multiplication, and Fractions Hunter McClure Grade 3

Hunter McClure2 Addition When adding, look at both numbers. Add your ones column, then your tens column and then your hundreds column. Don’t forget to carry your 1 if a column reaches higher than 10. Practice = = = =

Hunter McClure3 Subtraction When subtracting do the same as addition except subtract Begin with the ones column which is farthest from the subtraction sign work out from there. Practice = = = =

Hunter McClure4 Multiplication When multiplying it is like addition, but it is adding in groups. Such that if multiplying 5 and 8 you would have 5 groups of 8. Which when going through and adding it would come out to 40. When doing multiplication you do the same as with addition start with the ones and work your way out. In the problem 58x45, you would first multiply 5x8, then 5x5, that would be the first row under the equal sign, then you would put a place holder (0) on the next row and multiply 4x8 and 5x5. After all of this multiplication is complete add the two larger numbers to get the answer Now go to the next slide and do some practice

Hunter McClure5 Multiplication When doing this think of it in terms of pictures and every day events. Such that if John has 2 buckets with 5 apples in each bucket how many apples does he have? So you would draw you 2 buckets with 5 apples in each of them and multiply them out and go back and count them to check your work. ONLY DO THIS WITH SMALLER NUMBERS x =

Multiplication 5x2= 4x3= 15x5= 26x3= 16x10= 23x15= 123x135

Hunter McClure7 Division Division is a lot like multiplication except for the fact that when doing division the numbers are going into each and getting smaller rather than coming out of each other and getting larger. Therefore when dividing you will have a larger number over a smaller number and get a smaller number than the top number. The only exception for this is when you get a fraction.

Hunter McClure8 Division In a fraction there are three parts: the numerator, the denominator, and the division sign or bar itself. The numerator is the top number The denominator is the bottom number The denominator divides into the numerator For instance if you had 10/5= you would ask your self how many times does 5 go into 10. The answer to this would be 2 because if you have 2 5’s, you get 10 when you add them together.

Division 10/2= 8/4= 100/5= 5000/5= 1200/10= 584/4= 627/3= 15/5=

Hunter McClure10 Fractions To add and subtract fractions, you have to get a common denominator (the bottom number). To do this, you can multiply the denominator from the first fraction times the second fraction and the denominator of the second fraction to the first. Just remember what you do to the top of a fraction you must do to the bottom. After the common denominator is gotten, it is now time to add the numerator (the top number) THE BOTTOM DENOMINATOR STAYS THE SAME THROUGHOUT THE PROBLEM

Hunter McClure11 Adding and Subtracting Fractions Here is an example of combing denominators to get a common denominator. 1/2 + 1/4 = 6/8 The way this answer was gotten was I multiplied 2 and 1 by 4 and then multiplied 1 and 4 by 2 this would give you the denominator of 8. After this, all that was done was adding the numerators to get 6 because when you multiply those out you get 4/8 + 2/8= 6/8. This is adding fractions. You do the same for subtracting except you subtract.

Adding and Subtracting Fractions Adding and Subtracting Fractions 1/2 + 1/2= 2/3 - 1/3= 3/5 + 1/5= 2/3 - 1/10= 1/3 + 2/5= 5/6 - 3/4= 9/10 +17/20=

Hunter McClure13 Order of operations This is extra upper level math just for fun if you have extra time to practice Don’t forget the saying Please excuse my dear aunt sally. This stands for the order of working a problem For instance you do the parenthesis, then the exponents, then the multiplication, then the division, then the addition, then the subtraction. If you do the problem in this order and do the math correctly, you are sure to get the problem correct.

Order of Operations (7 x 4) - (6/3) = (8/4) x (5+3) = 9 + (3-2) = (2-5/3) + (6 x 3) = (9+3) - (3-2) = 9 x 5 + 3/1 - 4=