Exercise 6
In this practice session, our main objective is to excel in addition and subtraction within the range 10 to 90.
Upon each website refresh, a set of 3 random questions will emerge. It is crucial to perform the exercises accurately, swiftly, and with mastery before proceeding to the subsequent exercise.
When adding or subtracting from the thumb of your left or Right hand, the following patterns can be observed:
When adding or subtracting from the thumb of your left or Right hand, the following patterns can be observed:
- Right hand: +4 = +5 -1, left hand: +40 = +50 -10
- Right hand: +3 = +5 -2, left hand: +30 = +50 -20
- Right hand: +2 = +5 -3, left hand: +20 = +50 -30
- Right hand: +1 = +5 -4, left hand: +10 = +50 -40
- Right hand: -4 = -5 +1, left hand: -40 = -50 +10
- Right hand: -3 = -5 +2, left hand: -30 = -50 +20
- Right hand: -2 = -5 +3, left hand: -20 = -50 +30
- Right hand: -1 = -5 +4, left hand: -10 = -50 +40
Exercise 6.1
+ 10 = 
+ 20 = 
Congratulations if your response equals 40
10 + 10 + 20 = ?
Congratulations if your response equals 40
Exercise 6.2 + 70 = 20 + 50 + 20 = 
- 10 = 
- 50 = 
+ 40 = 30 + 50 - 10 = 
- 40 = 70 - 50 + 10 =
Congratulations if your response equals 30
20 + 70 - 10 - 50 + 40 - 40 = ?
Congratulations if your response equals 30
Exercise 6.3 + 20 = - 80 = 90 - 50 - 30 = + 50 = 
- 50 = + 40 = 
+ 30 = - 70 = 80 - 50 - 20 = + 60 = 10 + 50 + 10 =
Congratulations if your response equals 70
70 + 20 - 80 + 50 - 50 + 40 + 30 - 70 + 60 = ?
Congratulations if your response equals 70
Upon each website refresh, a set of 3 random questions will emerge. It is crucial to perform the exercises accurately, swiftly, and with mastery before proceeding to the subsequent exercise.
When adding or subtracting from the thumb of your left or Right hand, the following patterns can be observed:
When adding or subtracting from the thumb of your left or Right hand, the following patterns can be observed:
- Right hand: +4 = +5 -1, left hand: +40 = +50 -10
- Right hand: +3 = +5 -2, left hand: +30 = +50 -20
- Right hand: +2 = +5 -3, left hand: +20 = +50 -30
- Right hand: +1 = +5 -4, left hand: +10 = +50 -40
- Right hand: -4 = -5 +1, left hand: -40 = -50 +10
- Right hand: -3 = -5 +2, left hand: -30 = -50 +20
- Right hand: -2 = -5 +3, left hand: -20 = -50 +30
- Right hand: -1 = -5 +4, left hand: -10 = -50 +40
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