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301×2≈ 298×4≈ 8×403≈ 1﹣ =
56÷7= 25×4= 850﹣240= + =
①408×5=
②250×7=
③286×3=
④380+470=
⑤600﹣238=
⑥820﹣385=
25+46= 55+37= 300×6= 23×3=
120×4= 32×2= 210×3= 80﹣38=
= = 1﹣ = =
78×5≈ 204×4≈ 492×5≈ 694﹣310≈
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