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ozzi
3 years ago
14

Explain how you could add 678 + 303 using mental math

Mathematics
2 answers:
Bad White [126]3 years ago
6 0
Okay well I do it like this. 3+8=11. I put a 1 down and carry the other. so I do 7+0+1=8 so now I have 81, and last I do 6+3=9. so the answer would be 981.


Have a nice day!
bezimeni [28]3 years ago
4 0
Add the hundreds first then the tenths then the units. so add 600 +300 which is 900 then 70 +0 which is 70 then 8+3 which is 11 then add them all up which is 981.
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A machine makes 600 candies a minute. At this rate, how long will it take this machine to make 1800 boxes, each of which contain
Marta_Voda [28]
1800 boxes with 24 candies each

Total = 1800 * 24 = 43 200 candies

The machine makes  600 candies in 1 minute

                                 1 candy would take  (1/600) minute

                             43 200 candies would take    43200 * 1/600 = 72

                                                                     = 72 minutes.

Therefore the 1800 boxes would be done in 72 minutes.
3 0
3 years ago
PLEASE PLEASE PLEASE HELP!!
irga5000 [103]
  9            a
------  =  -----
  a            5

a^2 = 45 

a = 3<span>√5
</span>
  4            b
------  =  -----
  b            5

b^2 = 20

b = 2√5

answer: 

a = 3√5
b = 2√5

hope it helps
7 0
3 years ago
Calculate the length of the circumference of a circle with diameter of 7cm
Bad White [126]

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                C = pi * 7cm

                C = 21.99 cm 

8 0
3 years ago
I Am A Number That Is Double The Product Of 2 And 7. One Of My Factors Is 7 What Is My Other factor
tatyana61 [14]
If 7 × 2 = 14, then 14 + 14 = 28. So, 7 times 4 equals to 28. You can add 14 + 14 or multiply 7 and 4 to get your answer.
7 0
3 years ago
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Lostsunrise [7]
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There are 360 degrees in a crcle so this sectors area i (30/360) *36pi

=  3 pi
5 0
3 years ago
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