2.1 Addition Combinations Objective: I can use addition combinations to solve addition problems using mental math.

Slides:

Advertisements

Similar presentations

Distributive Property

Advertisements

Adding Real Numbers Section Think money = 8 Up 5, then up 3 more If you have $5 in your pocket and are given $3 more, how much do you have?

c – b < a < c + b ** Key word: between ** i.e. : between which two number must the value of x lie?

Mental Math Subtractions Additions

MENTAL MATH Adding Facts to = = =

MENTAL MATH General Review = 60 – 10 = =

Facts about Square Roots. Facts about square roots.

Combining Like Terms and the Distributive Property

Solving Inequalities Using Addition and Subtraction Lessons 3-1 and 3-2.

Step 1: Simplify Both Sides, if possible Distribute Combine like terms Step 2: Move the variable to one side Add or Subtract Like Term Step 3: Solve for.

2.2 Introducing Subtraction of Integers Chip Model Practice 9 – -3 = ? 9 – -3 = – 3 = ? -9 – 3 = – -3 = ? -9 – -3 = -6.

5.6 Complex Numbers. Solve the following quadratic: x = 0 Is this quadratic factorable? What does its graph look like? But I thought that you could.

B6 Add and subtract fractions mentally, when appropriate

Word Problems Clues. How To Solve Math Word Problems 1. Underline the question 2. Circle the key words 3. Will you +, -, x, or ? 4. Write down the math.

The Distributive Property allows you to multiply each number inside a set of parenthesis by a factor outside the parenthesis and find the sum or difference.

Adding and Taking Away The Easy Way Mental Maths Learning Objectives I will be able to use a number of different mental strategies to add and subtract.

Adding Integers. How do I add integers if the signs are the same? How do I add integers if the signs are the same? Examples: Examples: 1. r =

Lesson 2-4. When adding positives: Add numbers Sign is positive Examples:

Today we will be learning to explain the methods and reasoning used to complete calculations.

Solve an equation by combining like terms EXAMPLE 1 8x – 3x – 10 = 20 Write original equation. 5x – 10 = 20 Combine like terms. 5x – =

Adding and Subtracting Decimals

Review Adding Integers: (-5) = = (-7) = =

Techniques to make your mental math faster

Properties are special qualities of something. Addition and multiplication have special qualities that help you solve problems mentally = MENTAL MATH!!

2.1 Solving One Step Equations. Addition Property of Equality For every real number a, b, and c, if a = b, then a + c = b + c. Example 8 = For every.

1.2 Words and Expression.

WARM UP  Erin was told to find the perimeter of the square shown. She added and got 24. Then she added and she got Her final.

When estimating, 1.) You should be able to do the computation in your head 2.) Your answer should be close to the exact answer 1-1 Estimating sums, differences.

Steps for Solving Equations with Variables on Both Sides 1.Distribute when necessary. 2.Combine like terms if possible. 3.Add or subtract to get the variables.

Solving a System of Equations by Elimination SYSTEMS1.2- I can solve a system of equation by elimination.

Same Signs Different Signs 1) =+7 Objective- To solve problems involving operations with integers. Combining.

1 Math I can create equivalent expressions. Using the Distributive Property.

1.Homework Folders are marked and can be picked up 1.Late for 50% hand in to Mr. Dalton 2.Map test dates are on the wiki homepage 3.Lesson: Distributive.

5 Minute Math Review = = = 4. Solve 2/5 x 1/6= 5. Order these decimals from greatest to least

1.7 Simplifying Expressions Essential Questions: 1)What is the distributive property? 2)How do you simplify expressions?

6.23 I will model & solve addition equations Solve the problems + 4 = = 12 How did you know the answer?

Subtracting Integers Objective: Learn to subtract integers.

M 4 Lesson 22. Objective Solve additions with up to four addends with totals within 200 with and without two compositions of larger units. Note: Addends.

Grade 3 Mental Math Subtraction – Fact Learning. C: Subtraction – Fact Learning Strategies There are 4 subtraction fact Learning strategies: –Think Addition.

PROPERTIES USED IN ALGEBRA. What are they? ■Commutative Property ■Associative Property ■Identity Property ■Distributive Property ■Inverse Property.

Comparative Relational Thinking

Grade 1 Math Assessment Using Mental Math Strategies to Add and Subtract Indicators, according to the Saskatchewan Grade 1 Mathematics Curriculum Numbers.

The Distributive Property

THE DISTRIBUTIVE PROPERTY

Times Tables and Top Tips! The 2 times table

Knowing your math operation terms

One-Step Equations with Subtraction

Investigations Lesson 1.2 Adding and Subtracting 2 Digit Numbers

We Are Learning To Add two single digits which total more than 10

Lesson 2.1 How do you use properties of addition and multiplication?

Solve an equation by combining like terms

1.3 Solving Linear Equations

Adding and Subtracting Decimals

Adding and Subtracting Decimals

Addition Strategy: Multi-digit Mental Math

- Finish Unit 1 test - Solving Equations variables on both sides

Using the Properties Together

Radical Expressions N. RN

2.NBT.5 Place Value Addition and Subtraction

What do you think it means? Before:

Solving 1 and 2 Step Equations

Adding and Subtracting Fractions with common denominators

One-step addition & subtraction equations: fractions & decimals

Adding and Subtracting Mixed Numbers

Bell Ringer (in your Math Journal)

Presentation transcript:

2.1 Addition Combinations Objective: I can use addition combinations to solve addition problems using mental math

Mental Math What is it? What is it? Why do we use mental math? Why do we use mental math? Can you think of examples of when I would use mental math in the real world? Can you think of examples of when I would use mental math in the real world?

Addition Combinations to Help us with Mental Math Make 10 or 100 Combinations Doubles Near Doubles (+1, -1) Plus 10 or 100 Combinations Plus 9 or 90 Combinations Remaining Combinations

Make 10 or 100 Combinations Numbers that when added together make 10 or 100 Examples: = 10, = 100

Doubles Two of the same number added together. Examples : = 16, = 80, = 100

Near Doubles Numbers that are close to being the same. You add doubles then subtract the difference. Ex = ( ) Ex = ( )

Plus 10 or 100 Combinations Numbers that are added to 10 or 100. Ex = 59, = 149

Plus 9 or 90 Combinations Numbers that are added to 9 or 90. You should add 10 then subtract 1 or add 100 then subtract 10. Ex = ( ) = ( )

Remaining Combinations All other combinations of numbers. These are harder to do mental math. Ex How could I do mental math with this example?

Solve using QUICK mental math. Which mental math combinations did you use? (Ex ) (Ex ) (Ex ) (Ex ) (Ex )

Left Side Create a 5 tab foldable. Create a 5 tab foldable. On the outside write the following problems: On the outside write the following problems: On the inside left of the foldable write the addition combination strategy On the inside left of the foldable write the addition combination strategy On the inside right write the answer (circled) and explain using words how you solve using mental math. On the inside right write the answer (circled) and explain using words how you solve using mental math.

Left Side Directions: Cut out the addition combinations and glue in your notebook on the left side. For each one solve using mental math. Write down which mental math combination helped you solve, how you solved it in your head, and what you got for your answer. Example: Answer: _________________ Answer: _________________ Combination: ______________ Combination: ______________ Explain how you solved in your head: Explain how you solved in your head: Make 100 combinations (Ex ) Make 100 combinations (Ex ) Doubles (Ex ) Doubles (Ex ) Near Doubles (Ex ) Near Doubles (Ex ) Plus 100 Combinations (Ex ) Plus 100 Combinations (Ex ) Plus 9 Combinations (Ex ) Plus 9 Combinations (Ex )