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Estimating Sums to the Nearest 10 and 100

Estimate sums by rounding addends to the nearest 10 or 100
AB
41+4240+40=80
28+3930+40=70
48+3150+30=80
306+293300+300=600
450+109500+100=600
18+7420+70=90
47+7750+80=130
76+1680+20=100
39+5440+50=90
63+4460+40=100
64+5760+60=120
51+2250+20=70
61+2460+20=80
14+1610+20=30
341+350300+400=700
150+449200+400=600
760+126800+100=900
509+299500+300=800
405+269400+300=700
536+249500+200=700
245+225200+200=400
733+128700+100=800
357+507400+500=900
614+158600+200=800
146+454100+500=600
212+468200+500=700
633+147600+100=700
449+378400+400=800
21+37+1920+40+20=80
36+18+6840+20+70=130
183+328+211200+300+200=700
190+240+148200+200+100=500
Mrs. Wilcox

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