Exercise 4
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In this practice session, we will focus on mastering addition and subtraction within the range of 10, 20, 30, and 40.
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 4.1
- 40 = 
+ 40 = - 40 = + 40 = - 30 = 
Congratulations if your response equals 10
40 - 40 + 40 - 40 + 40 - 30 = ?
Congratulations if your response equals 10
Exercise 4.2
- 30 = + 40 = - 10 = - 30 = + 10 =
Congratulations if your response equals 10
30 - 30 + 40 - 10 - 30 + 10 = ?
Congratulations if your response equals 10
Exercise 4.3
+ 10 = + 10 =
Congratulations if your response equals 40
20 + 10 + 10 = ?
Congratulations if your response equals 40
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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