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complete to show how you can find the sum by making a ten, hundred, or thousand.
9+5=14
9+1+ blank
10+ blank
blank

90+50=140
90+10+blank
100+blank
blank

900+500=1400
900+100+blank
1000+blank
blank

9+5=14
9+1+4
10+4
14
same thing on the others, just add zeros

how do u do it

800+500=

800+500= 1,300
800+200+300
1000+300
1,300

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