Vocabulary
Rounding
Adding 3 Digits
Adding 4 Digits
Wild Card
100

a number close to the exact number

What is an estimate?

100

79 rounded to the nearest 10

What is 80?

100

124+335=

What is 459?

100

1,234+3,423=

What is 4,657?

100
If Pete studies for 27 minutes on Thursday and 75 minutes on Friday, about how many minutes will he have studied in all?
What is 102 minutes?
200

these symbols show grouping (DO THIS FIRST!)

What is parentheses?

200

189 rounded to the nearest 10

What is 190?

200

473+244=

What is 717?

200

4,876+2,324=

What is 7,200?

200
The number that is 100 less than 9,641.
What is 9,541?
300

this property states that the sum of any number and zero is the number

What is the identity property (of addition)?

300

354 rounded to the nearest 100

What is 400?

300

889+124= Round the sum to the nearest 100.

What is 1,013? Rounded to the nearest hundred, 1,000.

300
The sum of two addends is 4,568. What could be the unknown addends?
What is ...check team's answer...
300
Estimate. Round each addend to the indicated place value. $88 + $27; tens
What is ($90+$30) $120?
400

this property states that the order in which numbers are added does not change the sum

What is the commutative property (of addition)?

400

7,864 rounded to the nearest 100

What is 7,900?

400

Omar has 654 pieces of Halloween candy and Olivia has 299 piece of candy. If they put their candy together, how much do they have? Write an addition sentence with an unknown. Make an estimate (by rounding to the nearest 10). Then solve.

What is 654+299=X, a reasonable estimate would be 950, the sum is 953?

400
Abigail has $3,612 in her purple piggy bank. George has saved $2,987. They put their money together to buy plane tickets to Ireland. The total cost for tickets is $6,500. Do they have enough? Write an addition sentence with an unknown. Make an estimate (by rounding to the nearest 10). Then solve.
What is yes? They have about $6,600 or exactly $6,599.
400
Estimate. Round each addend to the indicated place value. $198 + $147; hundreds
What is ($200+$100) $300?
500

this property states that the way addends are grouped does not change the sum

What is the associative property (of addition)?

500

which is greater, 3,264 rounded to the nearest 10 OR 3,264 rounded to the nearest 100

What is 3,264 rounded to the nearest 100?

500

Spencer covered 182 miles trick-or-treating and Amiee covered 199 miles. It's reasonable  to say that they covered about a total of 400 miles on October 31. (True or false, defend with evidence)

What is TRUE? 182 is about 200, 199 is about 200. 200 + 200=400

500
Kayla traveled 3,671 miles to find the best Halloween costume. Kyle traveled 5,984 miles. It's reasonable that they covered a total of 12,000 miles to find the best costumes. (True or false, defend with evidence)
What is FALSE? 3,671 is about 3,700 and 5,984 is about 6,000. 3,700+6,000=9,700 NOT 12,000.
500
Estimate. Round each addend to its greatest place value. 585 + 277=
What is (600+300) 900?
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