How to play the math grabbing red flag game for young children

According to expert analysis, the test question "Win the Red Flag." Grade 1 Mathematics mainly tests your understanding of the test points such as addition within 100 (no carrying), subtraction within 100 (no abdication), addition within 100 (carrying), and subtraction within 100 (abdication).

Addition within 100 (not carrying):

It is set up on the basis of learning the oral arithmetic and estimation of addition within 100, so that students can master the calculation method more accurately.

Ability objectives: 1. Be able to understand the same digit alignment and the algorithm of adding from single digits, and master the vertical writing style.

2. Master the calculation method of two-digit addition and the law of pen addition.

Solution: Digit alignment: single digit to single digit, ten digits to ten digits, the plus sign is moved forward, the calculation starts from the single digit, the single digit and the single digit number are added, the number is written on the single digit, the ten digit is added to the ten digit, and the number is written on the ten digit.

Addition (carrying) within 100

Learning Objectives: Master the column-vertical calculation of carry addition, and apply carry addition within 100 to solve practical problems.

Method pointing: Use addition to calculate, column formula 38 + 25 = 63 using the learned two-digit plus two-digit carry addition column vertical calculation.

Pay attention to the vertical calculation: digit alignment, unit to unit, ten to ten, plus sign forward. The calculation starts from the single digit, and the full ten digits should be advanced to 1, and don't forget the horizontal answer.

You should also pay attention to the application questions: do not forget to write the unit in the result, and answer the complete calculation.

For example, there are 38 students in the deaf department and 25 students in the training department of Starlight Experimental School.

Solution: A: There are 63 students in the school.

Subtraction (abdication) within 100

Learning Objectives: Master the column-vertical calculation of carry addition, and apply carry addition within 100 to solve practical problems.

Method dialing: abdication subtraction is not difficult, digital alignment can be reduced, single digits are small enough to reduce, to borrow one from ten, ten digits back 1 is ten, more than a dozen minus a few I will calculate, how to reduce ten digits, ten digits retreat again and again.

Calculated from the bottom up, the red flag is at the top.

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Such questions are open-ended questions, the purpose is to cultivate students' flexibility in thinking, there is no fixed answer, so you can write 5-0=5, 5-1=4, 5-2=3, 5-3=2, 5-4=1, 5-5=0, as long as it is reasonable. I hope my answer is helpful to you.

Looking at the middle, the result from bottom to top is 5 4 3

Presumably, the top result should be 2

So fill in 5-3=2

This sum is ambiguous, and the single digit of the sum is 1 smaller than the second additive, which can also be understood as, compared with the number in the single digit, the second plus adds 1 one by one

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