Addition Strategies
Use a mental math/break down strategy to solve.
260 + 340 =
Strategies will vary. Answer is 600.
Use a mental strategy to solve.
84 - 29 =
Strategies vary. The answer is 55.
Draw a bar model to solve.
Abigail had $450. After spending some of it, she now has $170 left. How much money did she spend?
$450 - $170 = $280
Write an expression for the following problem.
Scholars ate 30 pieces of pizza on Thursday. They ate 60 more pieces of pizza on Friday. How many pieces of pizza did they eat on Thursday and Friday?
30 + 60
What is the value of the underlined digit?
9,472
Use a mental math strategy to solve.
440 + 197 =
Strategies will vary. Answer is 637.
Use a mental strategy to solve.
97 - 4 =
Strategies will vary. Answer is 93.
Draw a bar model and write an equation to solve.
A flower shop has 680 roses. It has 320 daisies. How many more roses are there than daisies?
Comparison model showing the difference:
680 - 320 = 360
What is a part-whole bar model?
A bar model that shows the sum (whole) of two or more values.
When rounding to the nearest hundred, 749 rounds to _______.
700
Use a mental math strategy to solve.
944 + 96 =
Use a mental strategy to solve.
526 - 97 =
Strategies will vary. Answer is 429.
Draw a bar model to solve.
At a fair, 195 people rode on the pirate ship in the morning. 97 rode it in the afternoon. How many rode the pirate ship that day?
A part-whole comparison model showing the sum:
195 + 97 = 292
What is a comparison bar model?
A bar model that shows the difference between two or more values.
When rounding to the nearest thousand, 4,501 rounds to ___________.
5,000
Use a mental math strategy to solve.
563 + 231 =
Strategies vary. Answer is 794.
The sum of two numbers is 100. One number is 35. What is the other number?
100 - 35 = 65 (answer)
Draw a bar model and write an equation to solve:
A candlemaker is selling candles at a craft fair. At the beginning of the day she had 150 candles. By the end of the day she has 52 left. How many did she sell?
150 - 52 = 98
What is an expresson?
Example:
280 + 200
Place 264 on a number line, including its nearest hundreds.
Define the term "sum."
The result of adding numbers together. Also known as the total, or whole.
Define the term "difference."
The result of subtracting one number from another. How much one number differs from another.
Draw a bar model and write an expression to solve.
There are 350 children and 820 adults watching the rodeo. How many more adults than children are watching the rodeo?
A comparison model showing the difference of 820 and 350.
Expression:
820 - 350
(answer is 470 more adults than children watched the rodeo)
What is an equation?
An expression on both sides of the equal sign that have the same value.
5 + 3 = 8
Draw a number line showing 3,000 and 4,000 and the midpoint between the two numbers.
The number line should show 3,000 and 4,000, with 3,500 in the middle of the two numbers.