What does one bead mean on the abacus? What does the next bead mean

RELATED INFORMATIONS

• 1. Each bead above the abacus represents ()
• 2. 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?
• 3. 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?
• 4. 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?
• 5. Put 10 red, yellow and white balls in a bag, at least take a few balls, you can get three colors of the ball
• 6. 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
• 7. 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?
• 8. There are 10 red, yellow and blue balls in one pocket. How many balls do you need to find out if you want to find out 10 balls of the same color? A、4 B、5 C、6 D、10 I don't think it's right At least... Wrong? It can't be 10. Can you guarantee it's the same 10 times? Then you go to buy lottery tickets! If you really mean to be more specific! Why?
• 9. A box contains the same size but different colors of the ball, respectively, red, yellow, green, white four colors of the ball each 10, ask at least to find out______ Five balls guarantee five of the same color
• 10. There are 20 red, yellow and blue balls of the same size and texture in the pocket. Only when you touch at least a few balls at a time can you guarantee at least four colors The same color? Process and answer
• 11. 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
• 12. What does the abacus represent?
• 13. How many upper beads and how many lower beads should be used to represent the "8" on the abacus?
• 14. As early as in the 14th century, China invented the abacus. Each bead above the abacus represents______ Each bead below represents______ ．
• 15. 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?
• 16. 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
• 17. 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?
• 18. Divide 15 apples into 5 parts, each of which accounts for () of the total number of apples
• 19. 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______ ．
• 20. 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