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Lady bird [3.3K]
3 years ago
14

I have to use mental math to solve everything and I'm only in 5th grade and I confused ‍♀️ also I don know what to do

Mathematics
2 answers:
Keith_Richards [23]3 years ago
5 0

Answer:

can you type the question? my chromebook wont show me the link

Step-by-step explanation:

kenny6666 [7]3 years ago
3 0

Answer:

B: 287

D: 300

Step-by-step explanation:

D

d is certainly a lot easier than b.  Start by understanding that 12 = 6 + 6 which you should be able to handle in your head.

6 * 25 + 6*25

150 + 150

300

This is a prized skill. You should practice it all the time. It leads to estimation which is something you should try to do in any math class you take.

B

How about 10 twenty-sixes + 1 twenty-six. Let's see how that works out.

10* 26 + 26

260 + 26

286   You should check to see if that works. Notice that the 2 and the 6 add to 8 which is what they should do if you are multiplying by 11. The end numbers add to the middle one for 3 digits. It get's a little messy when the end two number add to something greater than 10, but that's another story.


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<img src="https://tex.z-dn.net/?f=%5Csf%207-5x%3D-43" id="TexFormula1" title="\sf 7-5x=-43" alt="\sf 7-5x=-43" align="absmiddle"
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\sf\longmapsto \: x = 10

Step-by-step explanation:

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\sf\longmapsto \:  \frac{ - 5x}{ - 5}  =  \frac{ - 50}{5}

\sf\longmapsto \: x = 10

\boxed{\sf Answered \: By\: Subhash}

\boxed{\sf Answered \: By\: Subhash}

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