## Thursday, March 19, 2020

### Puzzle and Games: Guess the Operation

Puzzle:  Guess The Operation

Everyone, please stay safe, sane, and most importantly, healthy.  We are in unprecedented times.  My blessings to all of you, always.

Blog entries will continue to be published every Saturday and Sunday, and most Fridays, through the end of April.  I will be working on content for May soon.

Here's a game that you can play with students or to sharpen your wits.   I will let you figure out the solution and how you tackle these puzzles is up to you.

Each of the blanks, ____, needs an arithmetic operation:

-    subtract
×   multiply
÷   divide

Have fun!

Easy Level

Example:  82 ____ 24 = 1968

Fill in the box by either +, -, ×, or ÷.

Answer:  82 × 24 = 1968

Try these puzzles:

12 ____ 38 = 50 1334 ____ 58 = 23

425 ____ 25 = 17 27 ____ 15 = 405

68 ____ 46 = 22 631 ____ 399 = 1030

108 ____ 34 = 142 1200 ____ 750 = 450

Medium Level

Example:  49 ____ 58 ____ 20 = 87

Answer:  49 + 58 - 20 = 87

Hint:
The answer for the first box is either:  +, -, ×, ÷
The answer for the second box is either: +, -

Try these puzzles:

45 ____ 52 ____ 36 = 133 51 ____ 16 ____ 36 = 852

208 ____ 34 ____ 102 = 72 18 ____ 24 ____ 58 = 100

5 ____ 8 ____ 6 = 46 500 ____ 100 ____ 300 = 305

11 ____ 3 ____ 9 = 24 764 ____ 195 ____ 420 = 989

52 ____ 49 ____ 68 = 71 44 ____ 28 ____ 250 = 982

399 ____ 3 ____ 15 = 148 582 ____ 6 ____ 50 = 47

Harder Level

Good luck and happy solving.

Hint:  In this level, the choice of operations are +, -, ×

61 ____ 49 ____ 36 ____ 50 = 24

58 ____ 76 ____ 34 ____ 53 = 4495

99 ____ 39 ____ 49 ____ 59 = 50

88 ____ 76 ____ 46 ____ 50 = 6684

63 ____ 26 ____ 100 ____ 305 = 1433

402 ____ 118 ____ 386 ____ 453 = 217

153 ____ 38 ____ 500 ____ 205 = 5109

Eddie

All original content copyright, © 2011-2020.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.

### Casio fx-CG50: Sparse Matrix Builder

Casio fx-CG50: Sparse Matrix Builder Introduction The programs can create a sparse matrix, a matrix where most of the entries have zero valu...