1-5-4 Subtracting 1 vs. subtracting 10 [K-121 김동주] ◀ 소감문 필독 추천

[이상수]

1. EARLY MATH

5. Addition and subtraction within 100 100보다 작은 수의 덧셈과 뺄셈

Subtracting 1s and 10s 일의 자리와 십의 자리 빼기

1-5-4 Subtracting 1 vs. subtracting 10 1을 빼기 vs. 10을 빼기

https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/cc-early-math-sub-ones-tens/v/comparing-subtracting-1-and-10