1. 直接写出得数。(每题 1★)
$40+5= $ $69-9= $ $70+5= $
$56-6= $ $50+4= $ $71-1= $
$75-70= $ $30+1= $ $92-90= $
$3+80= $ $73-3= $ $50+9= $
$60+9= $ $90+2= $ $44-40= $
$20+7= $ $65-60= $ $60+4= $
$36-30= $ $90+4= $ $66-6= $
$97-7= $ $84-80= $ $58-50= $
$8+50= $ $30+6= $ $90+3= $
$49-40= $ $70+2= $ $28-8= $
$20+3= $ $64-4= $ $47-40= $
$88-8= $ $8+60= $ $80+4= $

45 60 75 50 54 70 5 31 2 83 70 59 69 92 4 27 5 64 6 94 60 90 4 8 58 36 93 9 72 20

2. 在$\square$里填上合适的数。(每题 2★)
$55-\square =5$ $84-\square =80$ $83-80= \square$
$33-\square =30$ $57-\square =50$ $30+\square =34$
$28-\square =8$ $54-4= \square$ $27-\square =20$
$\square -8= 60$ $\square +30= 32$ $7+\square =77$

50 4 3 3 7 4 20 50 7 68 2 70