一、口算。
$80 - 55 =$ $3×9 =$ $22×4 =$
$21×2 =$ $60÷3 =$ $71÷8 =$
$55 + 27 =$ $39÷3 =$ $22×3 =$
$18÷2 =$ $23×2 =$ $68÷2 =$
$4×7 =$ $62÷2 =$ $42×2 =$
$60 - 33 =$ $12×4 =$ $88÷4 =$
$11×2 =$ $90÷3 =$ $64÷2 =$
$15÷5 =$ $48 + 27 =$ $33×2 =$
$13×3 =$ $63÷3 =$ $60÷9 =$
$80 - 52 =$ $21×4 =$ $96÷3 =$
$80 - 55 =$ $3×9 =$ $22×4 =$
$21×2 =$ $60÷3 =$ $71÷8 =$
$55 + 27 =$ $39÷3 =$ $22×3 =$
$18÷2 =$ $23×2 =$ $68÷2 =$
$4×7 =$ $62÷2 =$ $42×2 =$
$60 - 33 =$ $12×4 =$ $88÷4 =$
$11×2 =$ $90÷3 =$ $64÷2 =$
$15÷5 =$ $48 + 27 =$ $33×2 =$
$13×3 =$ $63÷3 =$ $60÷9 =$
$80 - 52 =$ $21×4 =$ $96÷3 =$
答案
一、25 27 88
42 20 8……7
82 13 66
9 46 34
28 31 84
27 48 22
22 30 32
3 75 66
39 21 6……6
28 84 32
42 20 8……7
82 13 66
9 46 34
28 31 84
27 48 22
22 30 32
3 75 66
39 21 6……6
28 84 32
二、在(
$4000 +$(
(
(
(
$800 +$(
500
)里填合适的数。$4000 +$(
500
)$= 4500$ $2600 -$(2000
)$= 600$(
3300
)$- 300 = 3000$ $500 +$(3000
)$= 3500$(
6000
)$+ 3000 = 9000$ $7800 -$(800
)$= 7000$(
5000
)$+ 900 = 5900$ (3200
)$- 200 = 3000$$800 +$(
5000
)$= 5800$ $6900 -$(6000
)$= 900$答案
二、500 2000
3300 3000
6000 800
5000 3200
5000 6000
3300 3000
6000 800
5000 3200
5000 6000
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