1. 3 × 4 = _______ 5 × 7 = _______ 2 × 8 = _______
2. 9 × 1 = _______ 4 × 6 = _______ 7 × 5 = _______
3. 6 × 2 = _______ 8 × 3 = _______ 5 × 4 = _______
4. 10 - 7 = _______ 12 - 9 = _______ 15 - 8 = _______
5. 20 + 5 = _______ 18 + 7 = _______ 23 + 9 = _______
6. 50 - 20 = _______ 40 - 10 = _______ 30 - 8 = _______
7. 7 × 7 = _______ 9 × 9 = _______ 6 × 6 = _______
8. 8 × 8 = _______ 10 × 10 = _______ 5 × 5 = _______
9. 14 - 7 = _______ 21 - 9 = _______ 16 - 8 = _______
10. 23 + ( ) = 30 ( ) + 17 = 25 ( ) + ( ) = ( )
1. 12;35;16
2. 9;24;35
3. 12;24;20
4. 3;3;7
5. 25;25;32
6. 30;30;22
7. 49;81;36
8. 64;100;25
9. 7;12;8
10. ( )填法不唯一,如:6、8、8、16
1. 3 × 4 = _______ 5 × 7 = _______ 2 × 8 = _______
2. 9 × 1 = _______ 4 × 6 = _______ 7 × 5 = _______
3. 6 × 2 = _______ 8 × 3 = _______ 5 × 4 = _______
4. 10 - 7 = _______ 12 - 9 = _______ 15 - 8 = _______
5. 20 + 5 = _______ 18 + 7 = _______ 23 + 9 = _______
6. 50 - 20 = _______ 40 - 10 = _______ 30 - 8 = _______
7. 7 × 7 = _______ 9 × 9 = _______ 6 × 6 = _______
8. 8 × 8 = _______ 10 × 10 = _______ 5 × 5 = _______
9. 14 - 7 = _______ 21 - 9 = _______ 16 - 8 = _______
10. 23 + ( ) = 30 ( ) + 17 = 25 ( ) + ( ) = ( )
1. 12;35;16
2. 9;24;35
3. 12;24;20
4. 3;3;7
5. 25;25;32
6. 30;30;22
7. 49;81;36
8. 64;100;25
9. 7;12;8
10. ( )填法不唯一,如:6、8、8、16