Answer 1 full 10 bit forward 1 (probably grade 2) 2 forgot to compare from the previous level (integer comparison method 1 grade, negative number grade 6) 3. The numerator denominator of the fraction is enlarged or reduced at the same time under the same multiple size, and the size of 0 is increased or removed at the end of the small tree. (Grade 3) 4. Moving one place to the right will enlarge the quilt cover of 10, and moving 1 to the left will reduce 10 times, (level 3) 5. Prime number

But the factor is only 1 and its own number, and the composite number is a factor. Besides 1 and itself, there are other (fifth grade) types. Typing is too difficult. Give it to me! Also, if you want the answers to the exercises in the math book, I have them!