Word Problems
Vocabulary
Estimation
True or False
Add or Subtract
100

12 + (3 + 2) = 12 + (2 + 3)

Commutative Property

100

The property that states that when the grouping of addends is changed, the sum is the same.

Associative Property of Addition

100

Estimate using compatible numbers

172+32

Possible Estimate 175+25=200

100

8+3 = even sum

false, 11 is odd

100

349+508

857

200

(9+3) = (3+9)

Commutative Property

200

The property that states you can add two or more numbers in any order and get the same sum.

Commutative Property of Addition

200

Estimate 123+489 using rounding to the nearest hundred

100+500=600

200

23+4=even sum

false, 27 is odd

200

349-246

103

300

(2 + 3) + 1 = (1 + 3) + 2

Associative Property

300

Numbers that are easy to compute mentally

Compatible Numbers

300

Estimate by rounding to the nearest hundred

227+128

   227---200

+128---100

--------------

           300

300

sum of 147+3 is even

true, 150 is even

300

(246+418)-349

315

400

1 + 0 = 0

Identity Property of Addition

400

A number that is close to the exact amount

Estimate
400

Estimate by rounding to the nearest thousand

1,284+156

1,000+0=1,000

400

489 rounds to 500 when rounded to the nearest hundred

true

400

645-236

409

500

(5+9) + 3 = (9+5) +3

Commutative Property of Addition

500

The property that says the sum of zero and a number is that number

Identity Property of Addition

500

Estimate by using compatible numbers

486+48

Possible Estimate

500+50=550

500

789 rounds to 1,000 when rounded to the nearest thousand

true

500

500-99

401

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