Rounding
345 rounded to the nearest 10
350
203, 223, 234, 243
True or False
54 + 0 = 0
False
54 + 0 = 54
Estimate
243 + 134
240 + 130 = 370
200 + 100 = 300
Estimate
467 - 321
470 - 320 = 150
500 - 300 = 200
278 rounded to the nearest 100
300
What is 956 written in expanded form?
900 + 50 + 6
True or False
23 + 12 = 12 + 23
True
Commutative Property
Estimate
762 + 212
760 + 210 = 970
800 + 200 = 1,000
Estimate
276 - 256
280 - 260 = 20
300 - 300 = 0
949 rounded to the nearest 10
950
Order from greatest to least: 567, 576, 607, 557
607, 576, 567, 557
True or False
34 +(12 + 10) = (34 + 12) + 10
True
Associative Property
Estimate
456 + 325
460 + 330 = 790
500 + 300 = 800
Estimate
743 - 434
740 - 430 = 310
700 - 400 = 300
951 rounded to the nearest 100
1,000
What is two hundred fifty-four written in expanded form?
200 + 50 + 4
True or False
100 + (10 + 12) = (110 + 10) + 12
False
The numbers are not the same of both sides.
Estimate
101 + 224 + 132
100 + 200 + 100 = 400
100 + 220 + 130 = 450
Estimate
888 - 645
890 - 650 = 240
900 - 600 = 300
Which number does not belong?
245
251
255
253
255 - it rounds to 260
245 - it rounds to 200
Compare the two numbers:
three hundred thirty-two and 300 + 30 + 4
332 < 334
True or False
9 + (13 + 21) = (9 + 21) + 13
True
Both Commutative and Associative Property were used. Both sides equal 43
Estimate
423 + 245 + 309
420 + 250 + 310 = 980
400 + 200 + 300 = 900
Estimate
567 - 423 - 121
570 - 420 - 120 = 30
600 - 400 - 100 = 100