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①184×4=
②408×8=
③260×5=
④846+457=
⑤600-488=
⑥529-182=
504×4; 299×7; 969+990; 812×3; 592×3.
240+60= 62+38= 480﹣80= 690﹣480= 230×3=
999×0= 123×1= 300×5= 8×201≈ 403+398≈
1﹣ = + = ﹣ = + =
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