千克大米。
308+495= 88+246=
验算:
①243×7=
②407×8=
③707-389=
④230×4=
⑤▲346+258=
⑥▲600-284=
62+24= 98-28 = 56+40 = 19+65=
52+38 = 100-16 = 43+31 = 37-19=
620+340= 500+90= 60+150= 600-240=
186-36-74 = 20-12 ÷3= 185+10÷2 = 4+2×8=