291×0=
870×8=
60×5=
28-8÷4=
204+198≈
583-484≈
505×5≈
296×6≈
373 349 362 352 371 347 358 368
2.5+2=
3.8+1=
9.5-0.5=
3.12-0.32=
0.9-0.5=
3.5+2.4=
2+2.8=
4.5+7.8=
1-0.95=
3.8-2.9=
3.1+0.3=
0.3+2.7=
0.35+0.5=
3+0.3=
0.47+1.13=
0.35+0.63=
9-6.3=
4.5+4=
3.5+7=
4.5-0.4=
4-0.6=
3.1+3=
9.5-5=
0.95+0.05=
3.8+3.8=
1.1+2.3=
2.5+3.2=
7.5-5=
9.5-1.5=
0.74+0.16=
10×5= 30×3= 40×6= 0×25= 39×8≈
200×4= 110×5= 800×4= 320×3= 401×2=
81-58= 50×4= 41+29= 20×7=
540÷9= 66÷3= 48÷4= 93÷3=
30×7= 400×9= 800×7= 42+6×5=
600×8= 10×80= 70×9+3= 50×8+2=
2个十是
与15相邻的两个数是和