secrets-of-mental-math-malestrom

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Answers
CHAPTER 8: THE TOUGH STUFF MADE EASY
Four-Digit Squares (page 169)
1,468 “Reach off”
234
1. 1,234 2 1,468,000
34
234
1,000 54,756 (234 2 ) 234 2
1,522,756
34
9,000 “Lesson”
361
2. 8,639 2 74,502,000
39
361
8,278 130,321 (361 2 ) 361 2
74,632,321
39
5,624 “Tons”
312
3. 5,312 2 28,120,000
12
312
5,000 97,344 (312 2 ) 312 2
28,217,344
12
10,000 “Nachos”
137
4. 9,863 2 97,260,000
37
137
9,726 18,769 (137 2 ) 137 2
97,278,769
37
4,000 “Prayer”
382
5. 3,618 2 12,944,000
18
382
3,236 145,924 (382 2 ) 382 2
13,089,924
18
(No mnemonic needed)
29
3,000
6. 2,971 2 8,826,000
29
2,942 841 (29 2 )
8,826,841
268
200
400
322
324
300
174
100
400
364
53,600
1,156 (34 2 )
54,756
128,800
1,521 (39 2 )
130,321
97,200
144 (12 2 )
97,344
17,400
1,369 (37 2 )
18,769
145,600
324 (18 2 )
145,924