Question

write a number sentence to add 6 ones to 21

Answer 1

Brook bought 21 watermelons from her favorite store. When she got home she found out her mom also bought watermelons. Her mom bought a total of 5 watermelons, now they have a total of 26.

Answer 2

6 ones to 21??
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What's a number sentence?
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And c'mon, it's a NUMBER SEQUENCE!!
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Copying-pasting answers from homework to online...
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I hate this generation.
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Anyways, back on topic.
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What's a number sequence?
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Yeah?
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You don't know?
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You do know?
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Well, anyways, ...
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it's a sequence of numbers.
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the difference between the numbers is the same, or always increases/decreases by a certain rate, for example, y=2x. 
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so...
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Add six ones to 21.
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write down 21 added by 1 and going on 6 times.
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21...
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22.
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23...
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24...
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CMON
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25...
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26!!
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yay.