Using Compatible Numbers to Estimate

Slides:



Advertisements
Similar presentations
5th Grade Module 2 – Lesson 20
Advertisements

5-Minute Check 1) 5 x 7 2) 7 x 70 3) 9 x 20 4) 4 x 800 5) 6 x ) The each person to eat for one week is $200. Find the total cost for a family of.
1-5 Mental Math Warm Up Problem of the Day Lesson Presentation
6th Grade Math: 1-4 HW.
Math 5 Multiplication: 2-digit x 2-digit
1-4 Properties and Mental Math Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.
Whole number estimation, addition example: 28 round each # to the +110 _____ nearest ten. _____ Round 28 to 30 and 114 to 110. For example, 28.
5th Grade Module 2 – Lesson 18
Course Mental Math 1-5 Mental Math Course 1 Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day.
1-4 Properties and Mental Math 9/20/11 Warm Up Find each sum or product (24) 4. 7(12) 5. 3(91) 6. 6(15)
ALGEBRA READINESS LESSON 1-4 Warm Up Lesson 1-2 Warm Up.
Math 5 Estimating Division
Lesson 9.8: Multiplication of Decimals
Math 5 Multiplication: 3- digit x 2-digit Instructor: Mrs. Tew Turner.
January 21, 2010Math 201 OBJECTIVE: Students will be able to estimate a a percent of a quantity AIM: How can we use rounding and mental math to help us.
Module 2 Lesson 20 Estimate differences by rounding and apply to solve measurement word problems.
Grade 4 EnVisions Math Topic 7 Power Point Lessons.
Grade 4 EnVisions Math Topic 6 Power Point Lessons.
Arrays and Using an Expanded Algorithm
Understanding Angles and Unit Angles
5th Grade Module 2 – Lesson 17 Created by Leigh-Ann Pieragostini
Multiplying 2 digit by 1 digit numbers
Problem Solving: Draw a Picture and Write an Equation
Using mental math to divide
Using Multiplication Facts to Find Division Facts
Points, lines, and planes
Grade 4 EnVisions Math Topic 5 Power Point Lessons.
Mental strategies for multi-digit whole number multiplicati0n
Problem Solving: Two-Question Problems
Place Value Relationships
Line segments, rays, and angles
Good Morning Homeroom Specials – PE
Special Quotients Lesson 1-8 CCSS 4.OA.2, 4.OA.3
Rounding Whole Numbers
Can you solve this Anagram?
Multiplying 2 digit numbers by multiples of 10
Learning Goals Students will learn to round natural numbers so that they can approximate the result of given equations. Students will use their knowledge.
Lesson 16-5 CCSS 4.MD.6, 4.MD.5.a, 4.MD.5.b, 4.G.1
HIT THE TARGET!.
Measuring With Unit Angles
Happy Friday  Today you need:
Estimating quotients Lesson 9-2 CCSS 4.NBT.6, 4.OA.3
Using customary units of length
Fractions and Decimals
Equivalent Fractions and decimals
Estimating With Decimals
Arrays and multiplying 2-Digit numbers by multiples of 10
Warm Up Problem of the Day Lesson Presentation Lesson Quizzes.
Repeating Patterns Lesson 2-1 CCSS 4.OA.5
Estimating quotients with greater dividends
Wrap it Up Math Skills Review
Patterns and Estimating Quotients
Triangles Lesson 16-8 CCSS 4.G.2
Adding Mixed numbers Lesson 12-8 CCSS 4.NF.3.c
Dividing With Remainders
Line segments, rays, and angles
Subtracting Across Zeros
Arrays and an expanded algorithm
Adding fractions with like denominators
Comparing and ordering decimals
Dividing 2 digit by 1 digit numbers
Prime and Composite Numbers
Subtracting mixed numbers
Points, lines, and planes
Multiplication and Division Stories
Rounding.
Happy Friday  Today you need:
Splash Screen.
Patterns and Estimating Quotients
5-6: Multiplying by multiples of 10
Presentation transcript:

Using Compatible Numbers to Estimate Lesson 7-4 CCSS 4.NBT.5, 4.NBT.3, 4.OA.3 Literature Link: The Grapes of Math by Greg Tang (1-2 pages of riddles)

MATH Essential Questions How can greater products be found mentally? MATH Essential Questions

MATH Essential Questions How can greater products be estimated? MATH Essential Questions

Warm Up Write the multiplication and division fact family for these numbers. 6, 9, 54

Let’s look at the Envision Video for this lesson and take the quiz. Today’s Lesson In this lesson, you will use both compatible numbers and rounding to estimate solutions to multiplication problems with two 2-digit numbers. Let’s look at the Envision Video for this lesson and take the quiz.

Think and Write Who are some people you get along very well with? People whom we get along well with and enjoy being around are people whom we are compatible with.

30 is close to 31, so they are compatible. Compatible Numbers Compatible numbers are numbers that are close to the actual number, but easier to compute mentally. Example: 25 is close to 24, and is easy to compute with. It is a compatible number. 30 is close to 31, so they are compatible.

Think About It: Why is it easy to multiply with 25? Estimate 24 x 41 Rounding to the nearest ten gives 20 x 40 = 800 as an estimate. However, you can get a closer estimate by using compatible numbers which are numbers that are easy to compute mentally. 24 is close to 25. 41 is close to 40. 25 and 40 are compatible numbers. 25 x 4 = 100 so 25 x 40 = 1,000. Think About It: Why is it easy to multiply with 25?

Practice! Estimate to find the product. When possible, use compatible numbers. Look for numbers near 25. 26 X 42 22 X 26 64 X 24 89 X 43 53 X 54

Problem 1 Sean has 19 Lego sets. Each set has 96 pieces. How many pieces are there in all? Estimate using compatible numbers and solve.

Problem 2 Danielle is making necklaces for 16 friends. Each necklace has 44 beads. How many beads will Danielle use in all? Estimate using compatible numbers and solve.

Problem 3 Jack is apple picking. He picks 21 apples a minute. If he picks for 34 minutes, how many apples will Jack pick? Use compatible numbers to estimate and solve.

Problem 4 Isabel is slicing 24 cakes. She slices each cake into 16 pieces. How many pieces does Isabel slice in all? Estimate using compatible numbers and solve.

Lesson Wrap Up In this lesson, you learned use compatible numbers as another way to estimate solutions to multiplication problems. Reflection in Notebook: I would explain compatible numbers to a friend by…. Center Activity – Toss and Talk (7-4). Homework (7-4 Practice) for one “Paw Signature” and (7-4 Reaching & Practice) if you want two “Paw Signatures.” Website for Practice: http://www.mathnook.com/math/skill/roundingga mes.php