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Ms. Damji Madness
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290 + 390 (Write the expanded form mental math strategy)
200+90+300+90 (Estimate: 700) - Real Answer 680
39 + 99 = ? Use the round up/round down and adjust strategy
Estimate: 140, Real Answer: 138
180 + 190 = ? Use the round up/round down and adjust strategy
Estimate: 400, Real Answer: 370
180 + 190 = ? Use the round up/round down and adjust strategy
Estimate: 400, Real Answer: 370
2390 + 2910 = ? Use the round up/round down and adjust strategy
2400 + 2900 (Real Answer: 5300)
2300 + 4930 (Write the expanded form mental math strategy)
2000 + 4000 + 300 + 900 + 30
Name a number that is smaller than one.
Anything with a decimal!
Name a number that is bigger than one tenth.
Anything bigger than 0.10
Name a number that is bigger than one hundredths.
Anything bigger than 0.01
True or False: In a place value chart, the numbers to the right of the decimal get smaller.
TRUE! As you move to the right the numbers get smaller and smaller.
True or False: In a place value chart, the numbers to the LEFT of a decimal get BIGGER
True! As you move to the left, the numbers get bigger and bigger!
True or False: In a place value chart, there is a decimal.
True!
True or False: Five Tenths is bigger than Twenty Five Hundredths!
TRUE: Five Tenths (0.5 is bigger than 0.25)
True or False: Six tenths is smaller than Ninety Nine Hundredths
TRUE! Six Tenths (0.6 is SMALLER than 0.99).
True or False: 0.1 is bigger than 0.09999
True! One tenth is bigger!
True or false: A thousandths is bigger than a thousand.
False!
True or false: A hundred is bigger than a hundredth!
True!
True or False: A tenth is bigger than a ten.
FALSE! Tenth is smaller
Add: 824 + 539
1,363
Estimate: 564 + 239
600 + 200 = 800 (Real Answer: 803)
Estimate: 874 - 453
900 - 500 = 400 (Real Answer 421)
Estimate: 423 + 189
400 + 200 = 600 (Real Answer 612)
Estimate 659 - 453 to the nearest ten.
660 - 460 = 200
Round 296 to the nearest ten.
300
Add: 746 + 289
1,035
Estimate: 982 - 456
1,000 - 500 = 500 (Real answer 526)
Estimate: 478 - 251
500 - 300 = 200 (Real answer 227)
Estimate: 764 + 231
800 + 200 = 1,000. Real answer 995.
Add: 657 + 452
1,109
Round 863 to the nearest hundred.
900
Round 456 to the nearest ten.
460
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