方法 1
方法 1 的 3:简单的数字预测
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1
开始游戏。跟朋友说你正在玩一个数学魔术。让她暗暗地做一些计算，然后你能通过读心找出答案。
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2
写下你的预测。假装认真思考了一会，然后在纸上写下数字3。把这张纸对折，不要让任何人看到这个数字。
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3
让你朋友写下1到20之间的任一数字。她只要默默地写下数字，把纸藏好。
我们举个例子，假设你朋友选的是数字4。
这个小魔术适用任何数字，不过选1到20之间的数字能尽量避免你的朋友算错。
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4
让她把选取的数字加1。提醒她不要给你任何提示，甚至嘴巴都不要动。你只需要自己的精神力量。
如果她选的是4，那新的数字就是4 + 1 = 5。
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5
让朋友把新数字乘以2。让她把上一步得出的新数字乘以2。
5 x 2 = 10。
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6
再继续加4。把手放在头上，集中精神，告诉她把上一个数字加4。
10 + 4 = 14。
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7
除以2。告诉她就快好了，但是这个数字太大了，你看不见。让她除以2，好方便你看清楚。
14 ÷ 2 = 7。
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8
减去最开始的数字。让你朋友看看那张写着起始数字的纸条。用上一个最新的数字减去最开始的数字。
7 – 4 = 3.
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9
给她看你的预测。告诉她你终于读出了她的心。让她说出她最后得到的数字。她说完后，打开你的纸条，给她看你之前写下的数字3。无论她选的起始数字是什么，结果都会是3。
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方法 2
方法 2 的 3:猜年龄
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1
跟某人说你准备猜猜他的年龄。让他知道你准备用你的数字读心能力。如果他不想心算，可以给他一个计算器。
这个魔术在好朋友或者同学之间使用的效果不会很好，因为你可能本来就知道他们的年龄了。
选一个年龄大于10岁，小于99岁的人。
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2
告诉他，把自己年龄的第一个数字乘以5。提醒他默默地计算，不要向你透露他的年龄。
假设他是32岁，应该用数字3乘以5，答案是3 x 5 = 15。
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3
在结果上加4。告诉他把计算结果加4。
在我们的例子中，应该是15 + 4 = 19。
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4
告诉他把答案乘以2。现在你的实验对象应该把他最后的答案乘以2，让他算好之后告诉你。如果他是心算，要问问他“你确定吗？”，因为人们在这一步很可能会算错。
19 x 2 = 38。
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5
让他加上年龄的第二位数字。下一步，你正在“读心”的那个人需要加上他年龄的后一位数字。告诉他这是计算的最后一步。
因为我们举例的人是32岁，因此要在最后的答案上加2。他的上一个答案是38，所以计算得出38 + 2 = 40。
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6
问他最后的结果是多少。让他大声说出最后的数字，这样你和房间里的每个人都能听到。
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7
减去8，然后告诉他他的真实年龄。默默地将他给你的数字减去8。你可以向房间里的人宣布，这个结果就是他的年龄。
在我们的例子中，40 – 8 = 32。
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8
尝试一些变化。如果这个把戏你表演过很多次，大家可能会发现这是怎么一回事。以下是一些变式，可以继续保持神秘：
你可以不要加4然后再减8，而是换成加3再减6，或者加2再减4，甚至加25再减50。只要记住，你需要减去原来数字的“两倍”，因为在后面的步骤中原来的数字会翻倍。[2]
X
研究来源
如果要彻底地换种方法，可以试试这种：将年龄乘以2，加2，乘以5，然后减10。你需要乘以2和乘以5才能把他年龄的第一位数字（本例中是3）移到原来十位数的位置上（3 x 2 x 5 = 30）。
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方法 3
方法 3 的 3:魔法37
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1
给志愿者拿一支笔、一张纸。这里会涉及一些三位数的数字，大多数人是不愿意心算的。警告志愿者，这个需要做长除法。
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2
让他写下3个同样的数字。告诉他把纸条藏好，证明你没有作弊。让他写下三个数字相同的三位数。
比如，他可以写222。
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3
让他把每位数字相加。现在他需要把这三个数字都看成是独立的数字，然后计算它们的和。
例如 2 + 2 + 2 = 6。
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4
告诉他用较大的数字除以较小的数字。用三位数的数字除以较小的数字。给他一点时间计算。
222 / 6 = 37。
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5
宣布他的数字是37。只要你的志愿者正确地按照指示计算，他的结果肯定会是37。[3]
X
研究来源
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