17×40＝680,100－63＝37,3.2＋1.68＝4.88,2.8×0.4＝ 1.12
14－7.4＝6.6,1.92÷0.04＝48,0.32×500＝160,0.65＋4.35＝ 5
10－5.4＝4.6,4÷20＝0.2,3.5×200＝700,1.5－0.06＝1.44
0.75÷15＝0.05,0.4×0.8＝0.32,4×0.25＝1,0.36＋1.54＝2
1.01×99＝99.99,420÷35＝12,25×12＝300,135÷0.5＝270
3/4 + 1/4 =1,2 + 4/9 =22/9,3 - 2/3 =7/3,3/4 - 1/2= 1/4
1/6 + 1/2 -1/6 =1/2,7.5-(2.5+3.8)=1.2,7/8 + 3/8 =5/4
3/10 +1/5 =1/2,4/5 - 7/10 =1/10,2 - 1/6 -1/3 =1.5
0.51÷17＝0.03,32.8＋19＝51.8,5.2÷1.3＝4,1.6×0.4＝ 0.64
4.9×0.7＝3.43,1÷5＝0.2,6÷12＝0.5,0.87－0.49＝0.38
123+25=148 123-35=88 56×7=392 135÷5=27
248+89=337 ...146-23=123 ...155×5=775 ...456-12=38...
456+45=501 ...546-457=89 ...45×10=451 ...564-12=47...
879+54=933 ...896-546=350 ...56×12=672.45-5=9...
457+456=913...7+14=21 ...18-9=9...
8+16=24 ...25-5=20...9+18=27...56-45=11...10+20=30...45-23=22...
11+22=33...78-23=55...12+24=36...10-3=7 15-4=11 20-5=15
25-6=19 30-7=23 35-8=27 40-9=31 45-10=35 50-11=39 55-12=43
60-13=47 65-14=51 70-15=55 75-16=59 80-17=63 85-18=67
90-19=71 95-20=75 100-21=79 105-22=83 110-23=87 115-24=91
120-25=95 125-26=99 130-27=103 13+26=39...14+28=42...15+30=45...16+32=48...17+34=51...18+36=54...19+38=57...20+40=60...
21+42=63...22+44=66...23+46=69...24+48=72...25+50=75...
26+52=78...27+54=81...28+56=84...29+58=87...30+60=90...
31+62=93...32+64=96...33+66=99...5 ÷1 =5 10 ÷2 =5 15 ÷3 =5
20 ÷4 =5 25 ÷5 =5 30 ÷6 =5 35 ÷7 =5 40 ÷8 =5 45 ÷9 =5 50 ÷10 =5
55 ÷11 =5 60 ÷12 =5 70 ÷14 =5 75 ÷15 =5 80 ÷16= 5 85 ÷17= 5
90 ÷18= 5 95 ÷19= 5
