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20以内(破十法)练习题口诀.doc

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    • 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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