There are 600 pages in a Book of fairy tales, with pages 1, 2, 3 and 4. The number "2" appears () times

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• 1. The scores of each group were compared between 2 / 15 and 14 / 17
• 2. 37% 3 / 8 0.35 2 / 5 1 / 3 big to small comparison 3 (cycle of 3) 30.1% 0.34 0.31 (cycle of 31) comparison from large to small
• 3. Two fifths, one-third and three eighties are arranged from small to large
• 4. A Mathematical Olympiad in primary school Fill in the brackets below with seven numbers 0123789 to make it true （）＋（）＝（）－（）＝（） Two of the brackets are two digits
• 5. Seven eighths by six means ten by seven eighths, one sixth by two fifths
• 6. The following problem is to write the calculation process: one minus two fifths =? Five fifths minus fourteen fifths =? Eight ninths minus five sixths =? One sixth and three eighths =? Solving equation: (write calculation process) Half plus x = 5 / 6 x minus 7 / 10 = 1 / 5 x plus 1 / 4 = 1 / 2
• 7. The ratio is 1 / 4 to 1 / 9, 0.5 to 0.015, 7 / 5 to 5 / 2, 2 / 5 tons to 800 kg, and 1 / 4 to 20 Three quarters of a meter is more than 750 meters
• 8. Thirteen by two fifths by one thirteenth by five seventeen It's necessary to make the calculation simple and urgent!
• 9. Two thirds X: two fifths = fifteen sixteenth: eight ninths
• 10. Simple calculation: 24 / 5 × 11 / 8 + 61 / 10 △ 8 / 5 + 13 / 10 × 11 / 8
• 11. Speed for mathematics fairy tale speed
• 12. There is a number, which is not only a multiple of 15, but also a factor of 15. This number is ()
• 13. What are the multiples of 15 Explain why
• 14. Let these numbers be multiples of 3 and 5 15 () 3 () 0 24 () 8 () ()
• 15. 8. The numbers composed of 5, 0 and 9 are even numbers. The numbers composed of 5 are multiples of 5, even though the multiples of 2 and 5 are multiples of 3 Today is the day
• 16. There are four digital cards 8, 5, 0 and 9. Select two digital cards and make up numbers according to the requirements. ① the number made up is even. ② the number made up is a multiple of 5. ③ the number made up is not only a multiple of 2 and 5, but also a multiple of 3
• 17. There are 6-8 zeros in 6.8, right
• 18. 60 percent of a number is 12 times less than 3 times of it
• 19. 5 of a number is 12 more than 75% of the number. Find the number (equation)
• 20. 5 / 8 of a number is 25. What's 60% of this number