Addition
Subtraction
Subtract Across Zeros
Estimate Sums and Differences
Vocabulary
100
What is 3,567 + 2,341 =?
5,908
100
What is 394 - 75=?
319
100
What is 1,902 - 1,374?
528
100
Estimate the difference by rounding to the nearest ten thousand
651,354 - 417,823=?
650,000 - 420,000 = 230,000
100
What is the Commutative Property of Addition?
The commutative property states that number can be added in any ORDER and the sum remains the same.
200
What is 32,602 + 53,129 =?
85,731
200
What is 5,296 - 4,521=?
775
200
What is 80,600 - 16,434=?
64,166
200
Estimate the sum by rounding to the nearest thousand 45,671 + 7,142
46,000 + 7,000 = 53,000
200
What is the associative property of addition?
The associative property stated that the addends can be regrouped and the sum remains the same.
300
What is 19,634+13,768+7,926=?
41,328
300
A crayon company makes 36,742 red crayons, 12,345 yellow crayons, and 6,921 brown crayons. How many more red crayons are made than yellow and brown combined? (Hint: you must use two operations)
17,467
300
What is 800,740 - 201,568=?
599,172
300
Estimate the difference by rounding to the nearest ten thousand 1,000,000 - 348,546=?
1,000,000 - 350,000= 650,000
300
What is the identity property of addition?
The identity property states the sum of any number and zero is that number.
400
Jake had 3,456 Pokemon cards and 15,324 baseball cards. How many cards does Jake have altogether?
18,780
400
The Cycling Club's goal is to ride 8,213 miles by the end of four months. How many more miles do they need to ride in July to meet their goal?
2,796
400
A gym hold a fundraiser over four weekends in which a team runs laps for donations. The gym's goal is 50,000 laps. Over three weekends the teams ran 9,328 laps, 14,054 laps, and 7,492 laps. How many laps do they need to run the fourth weekend to reach their goal?
19,216
400
About how much greater is the area of the largest sea than the area of the smallest sea? Estimate the difference by rounding to the nearest thousand.
The largest sea is Caprian Sea and that rounds to 168,000 and the smallest sea is the Boravian Sea which rounds to 14,000 so the estimated difference is 154,000.
400
What is one mental math strategy you can use to solve an addition or subtraction problem.
Counting on, compensation, or break apart.
500
68G1
+3463
10434
Find what number is represented by G
What is 7
500
Denise wrote the subtraction below. What mistake did Denise make? What is the correct answer?
Denise did not regroup correctly in the thousands digit, the answer is 237,932
500
Mary subtracted 502,600 from 164,317. Is Mary's answer correct If not, explain why and what is the correct answer?
Mary's answer is not correct, she did not regroup correctly in the hundred thousands place. The correct answer is 338,283.
500
The fourth graders sang on a 2-day telethon for the local children's hospital. The hospital hoped to raise 760,000. On day one, they raised $398,139. On day two they raised $367,173. Did they reach their goal? About how much more or less did they raise. Estimate by rounding to the nearest ten thousand.
Yes they did meet their goal because they raised $771,312. They raised about 10,000 more than their goal because $771,312 rounds to $770,000 and their goal was $760,000.
500
What is an algorithm?
The steps you take to solve a problem.