20以内(破十法)练习题口诀.doc
19页20以内减法练习题(破十法)进位加法(凑十法口诀:看大数,分小数,凑成十,算得数) 退位减法(破十法口诀:看大数,分出10,减小数,加剩数7例:15 — 8 = 510218 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 13 — 7 = 12 — 7 = 11 — 7 = 15 — 6 = 14 — 6 = 13 — 6 = 12 — 6 = 11 — 6 = 14 — 5 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 。

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