Addition

Addition

Tips for addition

The first tip for solving addition problems is to teach students to "count on." Counting on works by having the student count on from the biggest number or the largest addend in an addition problem. For example, in the problem 7+4= the student counts up from 7 (seven) aloud by saying 'seven,.... eight, nine, ten, eleven." The student can use his/her fingers, toes or other method.

The second tip is to look for doubles, like 4 + 4 or 6 + 6, and add them first in a long addition problem. This is done because most children learn their doubles before they learn random pairs of addends.

The third is to go to the 12 addition facts that are "one more than" the doubles: 1+2, 2+3, 3+4, etc, all the way up to 12+13. The answer is always one more than the doubles, which we definitely know. Example: 7+8: Since 7+7 = 14, then one more is 15.

The forth is to move on to the "doubles plus 2". 1+3, 2+4, 3+5, up to 11+13. There are 2 ways to look at this: First, the double plus 2 more (some kids like this). Notice that if you change the "piles" and borrow one from the larger pile and put it into the smaller, you have doubles - of the counting number that is "missing" between the two you are adding. We call this group the Missing Doubles. Example: 6+8: If you borrow one from 8, that leaves 7. Put the one you borrowed in the 6 pile and you have 7 again. So 6+8 is the same as 7+7 and that we know also. Notice that 7 is the counting number between 6 and 8.

The fifth is finger counting. When adding 6 + 4, students must ask themselves "Open or closed?" With addition it is open. They open their hands and raise up four fingers (the smallest number). The palm of their hand says "6" and then they continue counting on the four fingers to get the sum.

The last is to memorize the essential addition problems. For example: the zero plus rule and the Communicative Law of Addition (0+9=9 -or- 0+X=X and 9+0=9 -or- X+0=X).

Number Elements Write Number Number Greatest Least Number Greater Less Number Pattern Number Comparison Number Fill Blanks Before/After Number Fill Blanks - Middle Tell Numbers Find Numbers Ordering Number Math Number Position Number Counting Number Word Number Word Number Number Even Odd Number CatchIt game

Addition

addition Addition Blank puzzle Addition Brick game Math Addition Concentration game Math Addition Match game Math Addition Shooting game Math addition Match game 1+1 Math addition Match game 2+1 Math addition Match game 2+2 Addition CatchIt game Addition Puzzle

Subtraction

subtraction Subtraction fill Blank puzzle Subtraction Brick game Subtraction Concentration game Subtraction Match game Subtraction Shooting game Subtraction Match game 2-1 subtraction CatchIt game subtraction Puzzle

Multiplication

multiplication multiplication fill Blank puzzle multiplication Brick game multiplication Concentration game multiplication Match game multiplication Shooting game multiplication Match game 1x1 multiplication Match game 2x1 Multiplication CatchIt game Corresponding multiplication Expression Multiplication Biggest Number Multiplication Puzzle

Division

division division file Blank puzzle division Brick game division Concentration game division Match game division Shooting game division Match game 2/1 Division CatchIt game Division Biggest Number Division Puzzle

Mixed Operation

Magic Square Arithmetic Puzzle Arithmetic Operator Mixed Operation Graph Sum Difference Puzzle Math Mixed Operation-Cross Puzzle Math Triangle Puzzle

Fraction

Basic Fraction Fraction Reduction Equivalent Fraction Fraction Whole Number Fraction Comparison Fraction Match Find Same Denominator Decimal Fraction Addition Fraction Subtraction Fraction Multiplication Fraction Division Fraction

Decimal

Decimal Addition Decimal Subtraction Decimal Multiplication Decimal Division Decimal Comparison Decimal Place Value Decimal Find Place Value Decimal Percent Decimal Fraction Addition Decimal Subtraction Decimal Multiplication Decimal Division Decimal

Negative Number

Addition Negative number Subtraction Negative number Multiplication Negative number Division Negative number Negative number CatchIt game

Percent

Find Percentage Percentage Conversion Percentage Find Percent Fraction Decimal Percent Percent Decimal Percent Puzzle Decimal Percent

coordinate

Find Coordinate Math Coordinate Shooting game

Time

Tell Time

Equations

Equation Basics Equations Addition Equations Subtraction Equations Multiplication Equations Division Equations Question Equations Inequality Equations Puzzle

Geometry

geometry Geometry Angle Geometry Area Geometry Perimeter

Word Problems

Math Word Problems

Tools

Square Root Calculator Fraction Calculator Fraction Reducer Prime Number Checker Circle Calculator Percentage Calculator Power Calculator Addition worksheet / test Generator Subtraction worksheet / test Generator Multiplication worksheet / test Generator Division worksheet / test Generator

Others

Factor Tree formula Power Calculation Scientific Notation