Lesson 120: Age Word Problems

Slides:

Advertisements

Similar presentations

What is he doing?.

Advertisements

What time is it? Coo-Coo one o'clock a quarter to seven

What’s the time? What time is it?. What time is it?

What does the minute hand say? Look at the minute hand and read the text!

Problem Solving Involving Algebraic Fractions. Algebraic Method 1)Let the unknown be denoted by a variable. 2)Form an equation involving the variable.

Consecutive Numbers n n+1 n+2 n+3 Even Consecutive Numbers n n+2 n+4 n+6 Odd Consecutive Numbers n n+2.

Twenty Questions Subject: -Translating expressions -Solving equations -Word problems.

Solve the following word problem. Manny is two years older Enrique. The sum of the their ages is 40. How old is Manny and Enrique? Let: m = Manny’s age.

Start StandardExpanded Rounding ADD.

SATMathVideos.Net In 5 years from now, Ryan will be 25% older than Bill. If Ryan is 20 years old now, how long until Bill's 25th Birthday? A) 5 years ago.

START It’s two o’clock It’s a quarter to ten It’s five to eight It’s twenty to one.

Unit I Review Lessons 4 to 8. Complete the table and write a system of equations A sailboat travels 24 mi. downstream in 3 h. The return trip upstream.

PEA202 – Lecture #10 PROBLEMS ON AGES & NUMBERS PEA202 Analytical Skills-II.

Order of Operations with Exponents

Grade 10 Academic (MPM2D) Unit 1: Linear System Word Problems with Linear Systems 1 Mr. Choi © 2017 E. Choi – MPM2D - All Rights Reserved.

7 Linear Equations in Two Unknowns

Linear Equations in Two Unknowns

Word Problems Involving & NUMBERS.

Lesson 65: Advanced Substitution

Table 4(Lawrence, Justin, Paul, Jaehoon)

Lesson 1.5 Concept: Read, order, graph and compare decimals

Word Problems and Their Types

Problems on Ages.

What time is it? Start.

Twenty Questions Subject:.

Define a variable and write each phrase as an algebraic expression

Solving Multiplication and Division Equations

Translating Math and English

Solving Linear Equations

Unit 4: Vocabulary - Describing People (p 45)

Polynomial Word Problems – Age

Warm-up September 26, 2017 Chuck is 2 inches shorter than his sister, Jan. If j is Jan’s height, write an algebraic expression to represent Chuck’s height.

8.4 Using Systems Objective:

TO PAST TELLING THE TIME.

An application of Solving linear equations involving two variables

Lesson 14: from problems to equations

WHAT TIME IS IT? OK NO! It's o’clock A quarter past

Drill #29 10/3/17 INB p. 62 INB p. 64 SPI Compare fossils found in sedimentary rock to determine their relative age.

8.4 Using Systems.

Make Ten Example: Name: ______________________

Dictation practice 4th Form Ms. Macarena.

Twenty Questions Subject:.

What time is it? What time is it?.

Talking about daily activities

Try again! Try again! Well done!

冀教版　七年级上册 Lesson 27.

Problems on ages and number

DAILY ROUTINE COOK HAVE A SHOWER GO TO BED BRUSH WAKE UP WATCH TV

= x 2 = = 20 4 x 5 = = 16 4 x 4 = = 18 6 x 3 = = 12 2 x 6 = 12.

Twenty Questions Subject:.

Problems on ages and number

HOW OLD ARE THEY? LET’S PLAY.

Last year Mary was twice as old as John.

Twenty Questions Subject:.

Twenty Questions Subject:.

Twenty Questions Subject:.

Twenty Questions Subject:.

Counting to 100 Counting by ones

1. Suppose the daughter is 12 years old. How old is the son?

MINUTES five past ten past quarter past 11 1 twenty past

Twenty Questions Subject:.

Algebraic Expressions and Terms

This Photo by Unknown Author is licensed under CC BY-SA

What’s your nationality? Where are you from?

HOW OLD ARE THEY? LET’S PLAY.

Problems on ages and number

Twenty Questions Subject:.

Twenty Questions Subject:.

Writing algebraic expressions – Word Problem

Presentation transcript:

Lesson 120: Age Word Problems

Most age word problems discuss the present ages of two or more people and their ages at some given time in the past and/or in the future. The key to these problems is the proper choice of unknowns. Subscripted variables are very helpful.

Example: A man is 13 times as old as his son Example: A man is 13 times as old as his son. In 10 years he will be 3 times as old as his son will be. How old are they now?

Answer: M = 13S M + 10 = 3(S + 10) S = 2 M = 26 N N N N N

Example: Five years ago Brenda was 4/5 as old as Layton Example: Five years ago Brenda was 4/5 as old as Layton. Ten years from now she will be 7/8 as old as Layton. How old is each now?

Answer: B – 5 = 4/5(L – 5) B + 10 = 7/8(L + 10) B = 25 L = 30 N N N N N

Example: Thirty years ago Barbie was 1 year older than twice Mary’s age then. Twenty years ago Mary was 4/5 as old as Barbie was then. How old is each woman now?

Answer: B – 30 – 1 = 2(M – 30) M – 20 = 4/5(B – 20) M = 32 B = 35 N N N N N

HW: Lesson 120 #1-30