one
I was doing the seventh week math exercise paper this morning, hehe, interesting. Before writing, I showed my grandfather the time. The teacher stipulated that it should be finished within 70 minutes. Can I do that?
I have calculated it, but there is a conceptual problem that makes me hesitate: the cover of the math textbook is about 54 (), and the appropriate unit name should be filled in brackets. It must be too small to fill in "square centimeter", so I filled in "square decimeter" immediately. However, is the cover of the book this big? Grandpa is wrong to think about it. There is no such a huge math textbook. What should I do? I said, "Let's wait until the teacher approves it on Monday." Grandpa took a pen and drew a point between 5 and 4, which became "5". 4 square decimeters ",but I still said," Let's wait until the teacher approves it on Monday. "
One more question: a rope is folded in half four times. How much is this rope per short section? As soon as I got the rope, I folded it in half. Grandpa said, "Folding once is half, twice is a quarter, and three times?" What about four times? "I suddenly understood, I blurted out," three times is one eighth, and four times is one sixteenth. "There is another problem: there are six pieces left in a box of cakes, which is three quarters of the original. How many pieces are there in this box of cakes?
I was confused at first, but then I thought about it and did it. Thinking about your little head is still not smart enough! But this paper was written in 60 minutes.
two
Everyone is talking about saving water, but how many people have done it? Today, I did an experiment: I put the bowl under a dripping faucet. In one minute, I counted 28 drops of water in the tap. I think: if I save 28 drops of water per minute, how many drops of water can I save in an hour according to this calculation? How was your day? 28× 60 = 1680 (drops), 1680× 24 = 40320 (drops). If every month is calculated as 30 days, every year is calculated as 12 months, one ton of water is about 20 million drops. That is, 40320× 30 = 1209600 (drops),1209600×12 =14515200 (drops), which is nearly one ton. Wow, you can save so much water in a year!
I was shocked to see such a large number. If every household saves so many drops of water every day, the water consumption will be reduced and the water fee will be reduced. Isn't this the best of both worlds? However, if every household wastes so many drops of water every day, can Grandpa Earth persist?
Water is not inexhaustible. In our daily life, because some units and individuals lack water crisis awareness and water-saving awareness, water resources waste can be seen everywhere. It is really deplorable to watch the "rushing" loss of water resources.
Let's talk about saving water. There are many ways to save water, such as washing vegetables with rice washing water, watering flowers with fish tanks, flushing toilets with bath water ... and washing vegetables with rice washing water can effectively remove pesticide residues on vegetables.
Implementing water conservation in families can save 70% of water as long as we get rid of bad habits. There are many examples of family wasting water, such as using toilet water to wash away odds and ends, wasting a lot of cold water to change a cup of hot water, and failing to maintain the equipment in time.
Protecting water resources is everyone's responsibility!
three
I didn't do well in math in this mid-term exam, only got 86 points. After school, an idea of strengthening math study suddenly came to my mind. How to work hard? Yes, I do several Olympic math problems every night. That's a good idea. I will tell my mother about it.
When I got home, I put my schoolbag away-"Hua", which startled me and didn't have time to tidy it up. I told my mother everything in my heart.
After listening, mother jumped up from the ground happily and said, "Good! All right! But you have to finish your homework every day to do the Olympic math problem, and you have to do it quickly, so that you have time to do it. "
"ok." I loudly responded to my mother.
After dinner that day, after finishing our homework, our family sat at the table and did the exercise of "drawing inferences from others" together. We agreed that whoever does it first will get a gift reward.
Haha, mom often doesn't get gifts, which means mom didn't do the right question. My father and I are both "smart" in the brain. We can often answer three questions correctly and get three gifts, which shows that we have made progress.
I took the math test again and got more than 90 points. I said to my mother: mom, it's all because we practice doing Olympic math every day! Mom nodded happily. Since then, I have been more energetic in doing Olympic math!
I think: we should not only do our usual exercises well, but also do our exams well, so that we can make progress every time in the exams.
Doing some Olympic math problems every night and accumulating experience in doing them is the golden key for me to learn mathematics.