How do senior two students solve 20 math problems?

Vertical calculation

480+ 160= 900-250= 880-350= 530-270= 420+380= 320- 160+ 150= 280+ 180+ 150= 890- 180-6 50= 199+ / kloc-0/99= 270+380= 1800+600= 1800-650= 1400-600= 880+680= 9 10- 190=

Off-model calculation.

5×6+60 72÷9-4 65-5×8 7×8-(20+25) 2+2×2×3

6+6×6 32÷4+48÷6 72-8×9 36÷6×7 16÷4÷2

35÷7×4 28÷4×6 56÷7+ 16 32÷4-5 5+4×6

700+800- 1200 1400-600-700 8×4-4×6 5×6+7×8

8 1÷9+3×4 55-6×9 5×8-(5+8) 72÷8×( 15-7 )

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My primary school math is very good, why is junior high school math getting worse and worse? Find a way to learn, kneel down! ! ! ! !