why are muliplication and division done before addition and subtraction.pptx
TRANSCRIPT
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
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