Why are muliplication and division done before addition and subtraction.pptx

What is the total?a. 3 + 7 • 5

b. How much money would Luz have if she had 3 pennies and 7

nickels?

Why are multiplication and division done before addition and subtraction?

Using context, how can this equation be made true?

2 + 8 = 28

Using context, how can this equation be made true?

2 + 8 = 28

2 tens + 8 ones = 28 ones

2 dozen + 8 halves = 28 ones

How do you go about adding …

2,416 + 753 =

Would you rewrite it or imagine it vertically?

2416 + 753

2 thousands + 4 hundreds + 1 ten + 6 ones+ 7 hundreds + 5 tens + 3 ones

The football team scored 4 touchdowns, worth 6 points each; kicked 3 extra points, worth 1 point

each; and kicked 1 field goal, worth 3 points. What was the team’s final score?

Express the relationship using English sentences, then use that sentence to write the situation in math language (an expression or an equation).

T = 4 • 6 + 3 • 1 + 1 • 3

Football Score

Total Score is 4 touchdowns + 3 extra points + 1 field goal

Car Price$21,000

Sales Tax is 6%

Dealer Rebate is $1,000

In the end, how much will you pay for your new car?

New Car

Christmas Shopping

There’s a 20% off sale on fashion accessories. You buy your mom a necklace regularly priced at $14 and a belt marked $23. You have a coupon for 10% off your purchase.

Back to School Shopping

You buy your son a pair of pants for $15 and five uniform shirts that are $12 each. You have a coupon for $5 off pants.

Express the relationship using English sentences, then use that sentence to write the situation in math language (an expression or an equation).

Basketball Score

Marquis’ team made 11 successful free throws (1 point each), 25 two-point shots, and 8 three-point shots.

Express the relationship using English sentences, then use that sentence to write the situation in math language (an expression or an equation).

Movie Night

Tickets :$8 Children 12 and under$10 Adults

You take 4 children and 2 adults to a movie and splurge for a large popcorn.

Multiply and then Add

46 x 35 230+1380 1610

We need to add and subtract LIKE items

a. 3 + 7 • 5

b. How much money would Luz have if she had 3 pennies and 7 nickels?

2 thousands + 4 hundreds + 1 ten + 6 ones+ 7 hundreds + 5 tens + 2 ones

Video

One is one … or is it?

How Much Money Do You Have?

You have three $20 bills, two $5 bills, eight $1 bills, and seven quarters. How much money do you have? Express the relationship using an informal sentence; then use that sentence as the framework for writing a mathematical equation of the problem. Explain and justify the computation step by step.

Why are multiplication and division done before addition and subtraction?

When do we simplify the exponent?

𝑥3

20 – 4 • 2 +

𝑥2