[1.] You have to make a valid math equation. The value on the left side of the equal sign must be equal to the value on the right side of the equal sign.
[2.] Only numbers are allowed on the right side of the equal sign (no arithmetic operations).
[3.] The first character in the equation must be a number between 1 and 9.
[4.] Do not forget: multiplication and division take precedence over addition and subtraction.
[5.] 13−2×5=3 is not the same as 13−5×2=3.
[6.] Computer keyboard:
[+ plus, addition]
[- hyphen, subtraction]
[x letter, multiplication]
[: colon, division]
[7.] The meaning of colors (scheme A):
5
The correct number (or operation) on the correct spot.
+
The number (or operation) is in the equation but not on this spot.
2
The number (or operation) is not in the equation.
[8.] The meaning of colors (scheme B, for players with reduced ability to perceive colors):
5
The correct number (or operation) on the correct spot.
+
The number (or operation) is in the equation but not on this spot.
2
The number (or operation) is not in the equation.
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