place value and rounding
Which of the following has 5 in the hundred’s place?
A. 3256 B.6527
C.5962 D. 2735
B. 6527
how can i decompose 8796
8000+700+90+60
true or false. why?
even + even = odd
false! even + even is even
what is an example of a quick change?
natural disasters
can humans slow weathering and erosion
yes
What is 620 rounded to the nearest 100?
a. 630 b. 700
c. 625 d. 600
d. 600
if i am adjusting when adding, can i add the same number to both sides? what should i do?
no. add one number to one side and subtract the same number from the other
will this equation have an odd or an even answer?
265 + 236
odd + even = odd
brown water is caused by
water erosion moving soil
what are 3 ways we can prevent land erosion
straw wattles
windbreak
breakwater
What is 398 rounded to the nearest 10s.
a. 390 b. 385
c. 400 d. 300
c. 400
if i am adjusting by subtraction, can I subtract different numbers from both sides?
no. i have to subtract the same number from both sides
what are the 3 ways to write a number
expanded (ex: 2000+300+50+9)
word (two thousand three hundred fifty nine)
standard (2359)
true or false?
weathering and erosion are the same?
false.
weathering is the breaking down of rock
erosion is moving the small pieces
besides designing bridges, what else is the job of a civil engineer?
they solve problems about erosion
solve this equation by estimating the answer (hint: you need to round)
897 + 308 =
10s: 900 + 310 = 1210
100s: 900 + 300 = 1200
decompose this equation
357 - 234 =?
357 - 234 =?
357- 200 = 157
157 - 30 = 127
127 - 4 = 123
Reina reads everyday for three weeks. In the first week, she reads 300 pages. In the second week, she reads 256 pages. If she read a total of 750 pages in the three weeks, how many pages did she read in the third week?
300 + 256 + ? = 750
556 + ? = 750
750 - 556 = 194 pages
what are 3 natural causes of land change?
landslides
floods
earthquake
what is the function of a windbreak?
it slows the wind from blowing soil away on farms
Sian and Jennifer are solving 589 + 658. Sian says they can round it to be 590 + 700. Jennifer says they can round to 590 + 660. Who is right? Why?
Jennifer is right. She rounded each number to the nearest 10s. Sian rounded 589 to the nearest 10s but 658 to the nearest hundreds.
adjust this equation
221 - 145 =
221 - 145 = 221 - 145 =
+5 +5 -5 -5
226 - 150 = 76 216 -140 = 76
Anna wanted to go to Disney World but needed to collect $890 for her trip. She collected $200 in the first week. In the second week she collect $160 more dollars than in the first week. How many more dollars does she need in the 3rd week to reach her goal?
2nd week = $200 + $160 =$460
3rd week = b
$200 + $460 + b = $890
$660 + b = $890
$890 - $660 = b
= $230 more
how do waves affect houses that are near beaches?
waves erode the land, making it weaker
i live on a mountain and there are quite a few landslides each year because it rains a lot. what is something i can do to reduce the amount of landslides that happen?
straw wattles