How many upper beads and how many lower beads should be used to represent the "8" on the abacus?
One upper grade bead represents 5
The next bead represents 1
8: In the same gear, it is indicated by one upper bead and three lower beads
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- 1. What does the abacus represent?
- 2. There are 20 beads of 5 different colors in the bag. To ensure that 4 beads of the same color are taken out, at least () beads should be taken out Will anyone
- 3. What does one bead mean on the abacus? What does the next bead mean
- 4. Each bead above the abacus represents ()
- 5. There are 161 glass balls. Red is five times as much as yellow, and yellow is as much as green. How many glass balls are there in each of the three colors?
- 6. There are three red, yellow and blue balls in the bag. If you take three balls out of your pocket, how many are there in all?
- 7. There are several red, yellow and green balls in the bag, and each ball has its own color. Now, if you feel out any one of them, the probability of getting a red ball is 13, and the probability of getting a yellow ball is 12. It is known that there are three green balls. How many red balls and yellow balls are there in the bag?
- 8. Put 10 red, yellow and white balls in a bag, at least take a few balls, you can get three colors of the ball
- 9. There are 15 small balls in black, white and red, which are mixed and put in the bag, from which several balls can be found? Write out the answer process that accords with the thinking level of primary school students
- 10. There are six red, yellow and blue glass balls of the same size in the pocket. At least how many can guarantee three glass balls?
- 11. As early as in the 14th century, China invented the abacus. Each bead above the abacus represents______ Each bead below represents______ .
- 12. There are 10 red, yellow, blue and white beads in one bag. In order to make sure that two of them have the same color, how many beads should be taken out at least?
- 13. 6 tons of concrete is made with 1 part of cement, 2 parts of yellow sand and 3 parts of stone on the construction site. Is 10 bags of cement of the brand as shown in the figure enough? 1 bag of 50kg To calculate the formula / step
- 14. One part of cement, two parts of yellow sand and three parts of stone are used to prepare a kind of concrete on the construction site. Now we need to prepare 6 tons of concrete. Is 10 bags of 50 kg cement enough?
- 15. Divide 15 apples into 5 parts, each of which accounts for () of the total number of apples
- 16. There are 30 apples in a pile, which are divided into 6 parts on average. Two apples are given to other children, and the rest is left______ Of the total______ .
- 17. 1: 2: divide 18 apples equally into 3 portions, each portion accounting for () of the total number, and 2 portions accounting for (). Do you find the difference between the above two questions? Please tell me
- 18. The 12 apples are divided into four parts, each accounting for a quarter of the total
- 19. Divide 6 peaches into 2 portions, each of which is half of the total number of peaches___ , each of which is___ A peach
- 20. Observe the following column: 1 / 2, 1 / 2, 1 / 12, Please tell me the law and the ninth number,