解放军战士义务植树，一共要植840棵，已经植树153棵，还需再植树多少棵？
直接写出得数．×= 1÷=÷60%=×15=﹣= 4.5+=×= 6.8÷10%=
直接写得数 24×= 72×= 12÷=÷3= 0÷=3÷=×=﹣×0=
口算×15=×2=×=×=÷=÷3=÷5=÷=
画一画． （1）= （2）÷4=
直接写结果：×3= 1÷= 1﹣﹣=×= 3﹣4×=×12=÷=+= 1﹣﹣=﹣=
×
= 1÷
=
÷60%=
×15=
﹣
×
= 6.8÷10%=
= 72×
= 12÷
=
÷3=
=3÷
=
×
=
×0=
×15=
×2=
×
=
×
=
÷
=
÷3=
÷5=
÷
=
=
÷4=
×3= 1÷
= 1﹣
﹣
×
= 3﹣4×
=
×12=
÷
=
+
= 1﹣
﹣
=
﹣
=
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