横式计算:726×7=57÷6=700×7= ÷6=30 × =140 ÷ = × = + + = .
口算.210÷30= 480÷80= 540÷60= 600÷12=350÷72≈ 250÷49≈ 340÷12≈ 424÷70≈810÷90= 16×60= 320÷40= 634÷8≈
竖式演练.78÷338÷9486÷3.
估算.32×49 63×29 52×68 43×22 23×39.
估算.88×7 59÷3 504×6 91÷9.
估算397×11≈ 207×99≈ 190×31≈49×62≈ 504×51≈ 91×68≈