Fourth grade math diary 1
20 1X year x month x day sunny day
I know this knowledge about cuboids: it has 12 sides, 6 faces and 8 vertices; The length of three sides intersecting a vertex is the length, width and height of a cuboid. The length of every two opposite sides is equal, and the area of every opposite side is equal. If the area of one opposite face is square, then the areas of the other four faces are the same. The formula of cuboid surface area is: length x width X2+ length x height X2+ width x height X2, and the other formula is (length x width+length x height+width x height) X2. Its volume formula is: length× width× height.
The knowledge about a cube is that it has 12 equal-length sides, 6 complete faces and 8 vertices. The formula of cuboid surface area is: side length x side length X6, and the formula of volume is side length x side length x side length.
The unified formula for the integration of cubes and cuboids is: the bottom area x is high and the cross-sectional area x is long. About the volume: the length of the volume is measured from the inside, 1 liter = 1 cubic decimeter, 1 ml = 1 cubic centimeter. The calculation formula of volume is the same as that of cuboid volume. If the topic asks you to calculate the unit of volume, but the first step of the topic asks you to calculate the unit of volume first, you have to convert it from the unit of volume to the unit of volume. The closest green color between unit of volume and unit of volume is 1000.
Fourth grade math diary 2
20 1X year x month x day sunny day
Today, when I was playing in the pasture, I saw that the cows and rabbits in the elf ranch were in the lactation period, and they could produce milk and rabbits. However, her animals are hungry and need to add pasture to produce. I did not hesitate to help him add 3 1 ranch, each ranch has 6 gold coins, 3 1 * 6 = 186 (gold coins), * *. Then I helped the elf's cows and rabbits produce, and * * * harvested 3 barrels of milk and 4 rabbits. A barrel of milk can sell for 55 gold coins, and each rabbit can sell for 39 gold coins. Harvest 3 barrels of milk, 55*3= 165 (gold coins), and harvest 4,39 * 4 =16 for young rabbits. 165+156 = 32 1 (gold coin), a * * harvests 321gold coin, 321-186 =135 (.
Fourth grade math diary 3
20 1X year x month x day sunny day
On Sunday, I finished my homework early in the morning. When my mother saw it, she came over and told me to play a game with you! All right! ? I readily agreed. Mother brought a round cardboard and fixed a rotatable pointer in the center of the cardboard with a nail. The cardboard is divided into 24 grids on average, and each grid is written with 1. 24 numbers. ? Mom, what are the rules of the game? Say it! ? I said impatiently. ? The rules of the game are simple, that is, when the pointer turns to an odd or even cell, the next number must be added. If it adds up to an odd number, I win; If the total is even, you win. ? Mom said with a smile.
I saw that the rules of the game were very simple. I played for more than a dozen times in a row, but I couldn't beat my mother every time. My mother smiled. ? Why is it always singular? I asked my mother puzzled. Mom said:? Think for yourself! ? So, I racked my brains to think, and finally reminded me of the formula that the teacher once said: odd+even = odd. Now I can see that if the pointer points to the odd number, then the next number must be even; If the pointer points to an even grid, then the next number added is odd, so no matter where the pointer points, the number added is odd. Mom won with this rule.
Fourth grade math diary 4
20 1X year x month x day sunny day
Recently, we have learned the recognition of scores, and the recognition of scores is not just a few scores. Instead, use charts to represent scores. For example, a circle is divided into four pieces on average, and each piece is a quarter of the circle. We also learned about true scores and false scores. False fraction means that the denominator is less than the numerator or the denominator is the same, and true fraction means that the denominator is greater than the numerator. So the false score is greater than 1 and the true score is less than 1.
For example, there are two identical graphs, and each graph is divided into two parts equally. The first figure draws two squares (half), and the second figure only draws one square (half). These two figures can be described by true points, that is, four points have only one point, and two-thirds are described by false points. It can also be described as one and a half. This is a fraction, and a fraction is a combination of an integer and a true fraction.
False scores can be turned into scores, and scores can also be turned into false scores. How to turn a false score into a score? Just divide its numerator by its denominator and read it from top to bottom. For example, three out of seven is two and a third. Quotient is an integer, divisor is a denominator, and remainder is a numerator. So it's two and a third.
Fourth grade math diary 5
20 1X year x month x day sunny day
One day, bitter rivals Zhang Xiaoping and Tan Xiaogang met again in the department store. This time, they didn't come to compete and guess riddles, but to use their brains. This time, Party A (Zhang Xiaoping) asked questions, but because Zhang Xiaoping was nervous (I was scolded once by Tan Xiaogang's crow mouth and lost once last time), I saw Zhang Xiaoping roll his eyes and see a piggy bank, so I smiled and said confidently, "Oh-oh-oh-oh-ah!" Party B (Tan Xiaogang) accepts questions. Xiaohong has a piggy bank, and all the coins are saved, of which 2 cents is 22 more than 5 cents. In terms of money, 5 cents is 40 cents more than 2 cents. It is known that these coins have 36 1 cent. Q: How much money is there in Xiaohong's piggy bank?
This time, Tan Xiaogang was blindsided and saw stars. He thought for a whole hour. Zhang Xiaoping wandered from the first floor to the 36th floor, and his feet were sore.
Looking at this Tan Xiaogang can finally have today, Zhang Xiaoping's heart is hilarious.
"Come, let me tell you one thing! Is it 0.02 for 22 coins with more than 5 cents? 22=0.44 (yuan), so there are 2 cents and 5 cents left. Nickel is 0.44+0.4=0.84 (yuan) more than the same 2 cents because it is more than the original 2 cents by 0.4 yuan. And each nickel is more than 0.05-0.02=0.03 (yuan), so the number of 0.03 contained in 0.84 is the number of nickels: (0.02? 22+0.4)? (0.05-0.02)=28 (pieces), 28+22=50 (pieces), 0.05? 28+0.02? 50+0.0 1? 36=2.76 (yuan)