Properties/Rules
35 − □ = 35.
Find the unknown number. What rule is this?
What is 0, subtraction rule?
Estimate 82,267 + 1,037 by rounding each number to the nearest thousand.
What is 82,000 + 1,000 = 83,000?
10,000 more than 25,983.
What is 35,983?
What is 1,000 less than 63,035?
What is 62,035?
Rick drove 12,363 miles one year and 15,934 miles the next year. How many miles altogether?
What is 12,363 + 15,934 = 28,297 miles?
83 + 35 = 35 + □.
Find the unknown number and name the property.
What is 83, commutative property?
Estimate 70,909 − 60,485 by rounding each number to the nearest thousand.
What is 71,000 − 60,000= 11,000?
Add:
2,267 + 1,037.
What is 3,304?
Find:
9,004 − 632
What is 8,372?
A recipe book will contain 1,045 recipes. There are already 632. How many more recipes are needed?
What is 1,045 − 632 = 413 recipes?
(16 + 5) + □ = 16 + (5 + 10).
Find the unknown number and name the property.
What is 10, associative property?
Estimate 432,901 + 177,235 by rounding each number to the nearest thousand.
What is 433,000 + 177,000 = 610,000?
Add:
432,901 + 177,235.
Estimate to check your answer.
What is 610,136, estimate: 610,000?
Find:
70,909 − 63,485
Estimate or add to check your answer.
What is 7,424, estimate: 71,000 - 63,000 = 8,000?
Parker has $32, earns $10, buys a video game for $28, and then earns another $10. How much money is left?
Write an equation.
What is $32 + $10 − $28 + $10 = $24?
Explain the subtraction rule with an example.
What is when you subtract 0 from any number, the result is the number and when you subtract any number from itself, the result is 0?
(35-35=0, 35-0=35)
Estimate 206,522 + 321,877 by rounding each number to the nearest ten thousand.
What is 210,000 + 320,000 = 530,000?
Add:
206,522 + 321,877.
Use an estimate to check.
What is 528,399, estimate: 530,000?
Find:
83,204 − 47,658
Use addition to check your answer.
What is 35,546, check: 47,658 + 35,546 = 83,204?
A school wants to collect 1,045 books. It collects 632 books in week one, 178 in week two, and 96 in week three. How many more books are needed to reach the goal?
What is 632 + 178 + 96 = 906 books. 1,045 − 906 = 139 more books?
Explain the difference between the associative and commutative property. Show an example.
What is commutative: change the order, such as 4 + 7 = 7 + 4. Associative: change the grouping, such as (2 + 3) + 5 = 2 + (3 + 5)?
Estimate $54,751 − $43,226 by rounding to the nearest thousand. Then find the exact difference and compare.
What is Estimate: $55,000 − $43,000 = $12,000. Exact difference: $11,525, the estimate is $475 greater?
A student solves:
48,675 + 27,849 = 65,414
Is the student correct?
What is no, the answer is 76,524, the student made mistakes regrouping.
Find and explain how you moved across the zeros:
60,002 − 28,457
What is 31,545?
Abby has 57 points, earns 37 more, loses 19, and then earns some more. She finishes with 100 points. How many points did she earn on the final turn?
Use a variable and write an equation.
What is 57 + 37 − 19 + p = 100. Since 57 + 37 − 19 = 75, p = 25 points?