29+47= 40+156= 100-57= 240+1200=
800×0= 72÷9= 78-34= 640-300=
89×7≈ 402×6≈ 607×3≈ 539×7≈
= = = =
204﹣78= 120×7= 960÷6=
3.8﹣2.98= + = ÷ =