One of the main indicators of the formation of a basic system of mathematical knowledge and skills in the category, “Arithmetic operations”, is the ability to subtract numbers and identify the properties of their actions within 10. Children must not only know the numbers from 0 to 9, but also be able to determine and write them. Moreover, he/she must know the direct count from 1 to 10 and count confidently up to 10 in forward and reverse order, perform operations of subtracting single-digit numbers within 10 in increments of -0, -1, -2.
The test results determined that this indicator, unfortunately, is not sufficiently formed. It shows the lack of basic skills to perform subtraction of single-digit numbers within 10 with a step of -0, -1, -2.
To develop this skill, we recommend regular exercises with materials:

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