1. Arrange 3 / 10, 2 / 7, 5 / 8 from large to small. 2, 4 and 2 / 5, 4 and 5 / 8, 4.5 from large to small

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• 1. A number is 2 less than 25 of 60. What's the number?
• 2. 60% of a number is 10% less than 2 / 5 of 10
• 3. Two fifths of a number minus 4.2 and its tenth to find the number
• 4. The ratio of two fifths to twelve is (); the simplest integer ratio equal to this ratio is (); the ratio of two ratios is ()
• 5. The ratio of the two ratios that make up the proportion is two fifths, and the two external terms are one half and one fourth. This ratio is () or ()
• 6. 8 minus 9 out of 10 is more than 4 out of 5,
• 7. Carefully observe the law of numbers, what is the most suitable to fill in the horizontal line 1, 8, 9, 4, 1 / 6 A.3 B.2 C.1 D.1 / 6 The second question is a sharp turn of the brain What is made on the same day as the expiration date
• 8. Observe the following group of data, according to a certain rule, the appropriate number on the horizontal line: - 5, - 2,1,4, () 10
• 9. A number less than 2 / 2 of a number is 3 / 5. Find this number
• 10. 25 of a number is exactly 23 of 50. This number is______ ．
• 11. Three quarters of a number is 35 more than two fifths of it. Find the number
• 12. Given that two fifths of a number is three fourths, how much is the number? The formula is ()
• 13. Two fifths of a number is 60. What's 20% of the number,
• 14. The number of female students is two fifths less than that of male students. What number is two fifths equal to
• 15. There are 440 boys in Hongxing primary school. The number of boys is 22 / 15 of the number of girls. What is the number of the whole school? Use equation to calculate equation
• 16. Observe the following formulas: 21-12 = 9; 75-57 = 18; 96-69 = 27; 84-48 = 36; 45-54 = - 9; 27-72 = - 45; 19-91 = - 72 (1) Please complete the above rule with words: exchange the ten and one digits of a two digit number. What is the difference between the new two digits and the original two digits______ (2) can you explain this rule with what you have learned? Give it a try
• 17. 54 out of 35 to 3.5
• 18. 5:8 to 1:4 (ratio) 0.6 to 1:2 (ratio) 0.5T to 200g (reduction ratio) 5:16 to 0.25 (reduction ratio) 0.36 to 6 0.8 * 2 / 3 + 1 / 5 / 0.75
• 19. There's a fraction where the addition of 2 to the molecule equals 3 / 5, and the subtraction of 2 from the molecule equals 1 / 3
• 20. For a fraction, the numerator minus 1 equals 1 / 3; the denominator minus 1 equals 1 / 2. What's the number? Primary school mathematics book 10 thinking questions