How to count backwards by 1, 10, 100, to 1000

I have been learning of counting backwards by 1, 10, 100, to 1000

here is my work and at the top is my screencastify 

Count backwards by 1, 10, 100 to 1000
	Subtract 100 from original number -100	Subtract 10 from original number -10	Original Number	Add 10 to original number +10	Add 100 to original number +100
Question 1	331	421	431	441	531
Question 2	539	629	639	649	739
Question 3	730	720	830	840	930
Question 4	62	152	162	172	262
Question 5	292	382	392	402	492
Question 6	805	895	905	915	1005
Question 7	748	838	848	858	948
Question 8	271	361	371	381	471
Question 9	533	623	633	643	733
Question 10	806	896	906	916	1006

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count backwards by 1, 10, 100, to 1000

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