Finding the range

For maths I did finding the range for some maths and some of the questions were really tricky for me. But I got there.
This is what my maths looks like.

Finding the Range - Using an Effective Subtraction Strategy

Range = Highest data - lowest data

Our three go to strategies:

• PV: 73 - 27 = 73 - 20 = 53 / 53 - 7 = 46
• EA: (73 + 3)  (27 + 3) = 76 - 30 = 46
• Reversing: 27 + __ = 73 / 27 + 3 = 30 / 30 + 43 = 73 / 43 + 3 = 46

  

Work out the range for these sets of numbers. You must use each go to strategy at least once.

Highest Data	Lowest Data	Range	Strategy / Working Out
132	98	34	(132+2)-(98+2)=  134-100=34  EA
210	61	149
72	29	43
43	27	16	(43+3)-(27+3)=    46-30=16 EA
86	17	69	86-10=76           76-7=69  PV
365	49	316	365=300+65       65-49=      65-40=25  25-9=16   16+300=316 PV
1084	196	888	(1084 + 4)-(196 +4)=1088-200=  (1000-200) +88= 800+88=888  EA