This is a first-grade exam additional question of a famous school in Shanghai, the difficulty of the question is not small, most children have miscalculated.
The first-grade math test finds regular numbers: 66, 77, 88, 99, ().
Some children write the answer 1010 without thinking, because he divides each number into two groups, and 678910 is the law of increment, do you think it is right?
Summary of common methods for first-graders to find regularities:
1, adjacent numbers through addition and subtraction to find the law, such as 5, 10, 15, 20, 25.
2, single and double digits to find the law, is also the addition and subtraction method.
3, grouping to find the law, the common is 2 numbers a group, or multiple numbers a group, sometimes there will be 4 numbers for a group of situations.
4, the overall method, do not look at the position only look at the number of addition and subtraction, and then to consider the position relationship.
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