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What is the answer to the final exam of the second volume of mathematics in grade four?
The questions and answers of oral calculation in the second volume of mathematics in the fourth grade of primary school are as follows:

First, 640÷80= 8.

Second, 15×5= 75.

Three. 23×3= 69

Four. 12×2×5= 120

Five, 480÷80= 6

Six, 16×5= 80

Seven. 27×3= 8 1

Eight, 90÷ 15= 6

Nine, 48÷4= 12

X.640÷ 16=40

Eleven, 39÷3= 13

12.24×20= 480

Thirteen. 32×3= 96

Fourteen, 48÷ 16= 3

Fifteen. 12×8=96

16.27×3= 8 1

Seventeen, 5614 = 4

Eighteen, 24÷8=3

Nineteen, 14×2=28

Twenty, 83-45 = 38

2 1, 560÷80=7

Twenty-two, 96÷24=4

23,40 ÷ 20 = 2

24.40×30= 1200