1, one by one gets one.

2. One or two equals two. Two plus two equals four.

3. Best of three games. Two or three equals six. Three, three makes nine.

4. Four quarters. Twenty-four equals eight. Three, four, twelve. Forty-six

5. Five fifths. 25 10. three, five, fifteen, four, five, twenty-five, five, twenty-five

6. Six o'clock is from one to six o'clock. 262. 368. Four, six, twenty-four, fifty, sixty and thirty. Six, six, thirty-six

7. Seven sevenths. 274.372 1 .4, 7, 2, 8.5, 7, 35.6, 7, 42, 77, 49.

8. Eight eighths. 286. Three, eight, twenty-four. Four, eight, three, twelve, five, eight, forty. Six, eight, four, eight seven, eight, five, sixteen eight, eight, sixty four.

9. Nine out of nine. 298. Three nine two seven. Four, nine and thirty-six. Five, nine, four, fifteen. 6954. Seven nine six thirteen. Eight, nine and seventy-two 998 1.

The function of 99 multiplication formula:

1 can help students memorize multiplication tables and improve their computing ability. Learning the formula of 99 multiplication can help students memorize the multiplication table faster, thus improving their calculation ability.

2. It can improve students' mathematical thinking ability, and learning the formula of 99 multiplication can help students better understand mathematical knowledge, thus improving students' mathematical thinking ability.

3. It can also help students solve complex mathematical problems faster, and learning the formula of 99 multiplication can help students solve complex mathematical problems faster, thus improving the calculation speed.

4. It can also help students better understand mathematical knowledge, and learning the formula of 99 multiplication can help students better understand mathematical knowledge, thus improving their mathematical thinking ability.