一、我会计算。
$16 - 8 = $ $6 + 8 = $ $13 - 8 = $ $7 + 6 = $
$17 - 8 = $ $10 - 9 = $ $19 - 9 = $ $12 + 5 = $
$12 - 8 = $ $8 + 7 = $ $14 - 8 = $ $15 - 8 = $
$4 + 15 = $ $5 + 8 = $ $8 + 8 = $ $3 + 8 = $
$16 - 8 = $ $6 + 8 = $ $13 - 8 = $ $7 + 6 = $
$17 - 8 = $ $10 - 9 = $ $19 - 9 = $ $12 + 5 = $
$12 - 8 = $ $8 + 7 = $ $14 - 8 = $ $15 - 8 = $
$4 + 15 = $ $5 + 8 = $ $8 + 8 = $ $3 + 8 = $
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
三、在括号里填上合适的数。
$13 -$()$= 7$ $8 +$()$= 15$ ()$+ 7 = 6 + 8$
()$- 6 = 5$ $15 - 6 = $() $17 - 8 = 15 -$()
$13 -$()$= 7$ $8 +$()$= 15$ ()$+ 7 = 6 + 8$
()$- 6 = 5$ $15 - 6 = $() $17 - 8 = 15 -$()
答案
6 7 7 11 9 6
登录