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QR Challenge: Subtracting one and two digit numbers using a number line

QuestionAnswer
26-4=22
13-8=11
19-4=16
12-7=5
22-8=18
17-8=11
19-9=10
9-8=1
18-9=9
18-11=7
13-10=3
22-4=18
26-2=24
20-8=12
29-9=20

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