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  Here is the answers for the  Part 4: Calculation Games Training B (Question 31-40) 31.    There are 10 kinds of classification.  Decompose 60 into prime factors: 60=2×2×3×5.   In addition to 1 and 60, the divisors of 60 are:   2, 3, 5, 2×2=4, 2×3=6, 2×5=10, 3×5=15, 2×2×3=12, 2×2×5=20, 2×3×   5=30.   The following can be grouped according to different divisors.   60÷2=30 (group), 60÷3=20 (group), 60÷4=15 (group), 60÷5=12 (group), 60÷6=10 (group), 60÷10=6   (Group), 60÷12=5 (group), 60÷15=4 (group), 60÷20=3 (group), 60÷30=2 (group).   Therefore, each group of 2 people is divided into 30 groups, each group of 3 people is divided into 20 groups, each group of 4 people is divided into 15 groups, each group of 5 people is divided into 12 groups, each group of 6 people is divided into 10 groups, and each group of 10 people is divided into 6 groups.   Groups of 12 people are divided into 5 groups, each group of 15 people are div...

Here is the answers for the  Part 3: Calculation Games Training A (Question 21-30) 21. 4+4+4=12 (person) or 3×4=12 (person) 144 Represents how many groups can be divided into: 144÷12=12 (groups). Because each group has 4 tables, there are 12 groups of tables: 4×12=48 (tables). Because each group has 3 chairs, there are 12 groups of chairs: 3×12=36 (chairs). 22.  (3-1) × 2 = 4 meters, (4 + 1) x 2 = 10 meters 23. There are 14 students, 14×7+6 = 104 books 24. First row:  68-(25-1)×2 = 20, Middle row: (20+68)÷2 = 44, Total rows: 44x25 = 1100 25. Trump's house number = 8 26. Male: 25, Female: 75 27. Total 113 balls 28. Glove: 15 BTC, Socks: 10 BTC, Hat: 10 BTC 29. Sand: 100 kg, Cement: 25 kg 30. Teddy: 9, Christine: 16 Read more interesting posts: Why You need to Buy Bitcoin now? It worth $1,000,000 per Bitcoin soon! Why Buy Bitcoin as Store of Value and not gold, bond or stocks? Why Japanese Convenience Stores are so special? 20 Free Learning Websites to Improve Your...

Here is the answers for the  Part 2: Concept of Number Training B (Question 11-20) 11. 3  21 12. 22 times. 13.（5+1）×5+1 = 31  14.  ×, -, ÷, × | ×, -, ÷, + 15.（30÷6+1）x 2 = 12 flags 16. Total number of sheep is 15. When I first thought of "Half, but no sheep was killed, and there was no remaining" in the title, I deduced that the total must be the base. This question needs to be pushed forward. Assuming that the number of sheep allocated to the eldest daughter is x, the second son is allocated 2x, the eldest son is allocated 4x, and the wife should be allocated 8x. Therefore, the total number of sheep is: x+2x+4x+8x=15x. And because the wife is divided into half of all sheep plus half, then 15x÷2+0.5=8x, x=1. 17.  Because the two ropes are cut to the same length, the difference between the lengths of the two ropes has not changed. The remaining length of rope A is twice that of rope B, which is actually (2-1) times longer than rope B. The length is a standar...