一、我会计算。
$16 - 8 = $
$17 - 8 = $
$12 - 8 = $
$4 + 15 = $
$16 - 8 = $
8
$6 + 8 = $14
$13 - 8 = $5
$7 + 6 = $13
$17 - 8 = $
9
$10 - 9 = $1
$19 - 9 = $10
$12 + 5 = $17
$12 - 8 = $
4
$8 + 7 = $15
$14 - 8 = $6
$15 - 8 = $7
$4 + 15 = $
19
$5 + 8 = $13
$8 + 8 = $16
$3 + 8 = $11
答案:
8 14 5 13 9 1 10 17 4 15 6 7 19 13 16 11
二、探究$14 - 6$的计算方法。

答案:
把14分成
(4)和
(10),
先算(10−6 = 4),再算(4 + 4 = 8)。
把6分成4和2,
先算(14−4 = 10),再算(10−2 = 8)。
8 8
把14分成
(4)和
(10),
把6分成4和2,
8 8
三、在括号里填上合适的数。
$13 -$(
(
$13 -$(
6
)$= 7$ $8 +$(7
)$= 15$ (7
)$+ 7 = 6 + 8$(
11
)$- 6 = 5$ $15 - 6 = $(9
) $17 - 8 = 15 -$(6
)
答案:
6 7 7 11 9 6
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