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What should I do if I practice the second book of primary school mathematics for one year?
6 1. There are 45 chairs in the classroom. Take some, and there are four left. How many/much?

62. Xiaoming is 5 years old and his sister is 8 years old. 10 years later, how old is the difference between the two?

63. Xiao Li has 45 stamps, more than Xiao Hong 15. How many pictures does Xiaohong have?

64. Xiaoming planted five flowers. There are as many Xiaohong in Kobanawa as Xiaoming. How many flowers did they grow?

65. Xiaoguang is catching bugs in the field. Eight in the morning and 12 in the afternoon. How many have you caught all day?

There are 35 apple trees and 26 longan trees in the orchard.

(1) How many trees are there in a * *?

(2) How many longan trees are less than apple trees?

67. Xiaoying made 42 red flowers, 34 yellow flowers and 15 white flowers.

(1) How much more red flowers are there than yellow flowers?

(2) How much less white flowers are than red flowers?

(3) How much less white flowers are than yellow flowers?

(4) How many flowers are there in a * * *?

68. A * * * has 96 apples. I sold 26 in the morning and 39 in the afternoon. How many apples are left?

69. From the front, Xiaoming ranks 18, and from the back, he ranks 15. How many people are there in this row?

70. A shell 25 yuan, a conch 13 yuan. How much can 50 yuan buy?

7 1. Xiaohong jumped 25 ropes and Xiaogang jumped 36 ropes. How many did he jump?

72. Two frogs ate 40 pests, one ate 15, and how much did the other eat?

73. 32 bottles of fruit juice for boys and 0/9 bottles of fruit juice for girls. How many bottles do boys have more than girls?

74. Xiaoming has pulled out 16 radishes, and there are 48 radishes left in the field. How many people are there on the battlefield?

75. Mickey picked 48 peaches, and there were more monkeys than Mickey 12. How many did the little monkey pick?

76. Xiaoming has 37 sweets. Xiaohong has less 19 sweets than Xiaoming. How many sweets does Xiaohong have?

77. One * * * is going to fold 43 paper cranes. 19 is ready. How much more do you want to discount?

78. Xiaoming jumped 25 times, Xiaogang jumped 17 times, and how many times did Xiaogang and Xiaoming jump?

79. Xiaoming jumped 47 ropes, and Xiaohong jumped 18 again, as much as Xiaoming. How many did Xiaohong jump?

80. There were 45 people on the bus, 19 people got off and 23 people got on. How many people are there now?