ayo10
ayo10
15-12-2017
Mathematics
contestada
The sum of 21 and a number is 30
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VivaciousLyla
VivaciousLyla
15-12-2017
Hi!
Use the opposite operation to solve: (Subtraction)
30 - 21 = 9
So, the sum of 21 and 9 is 30.
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