内容正文:
练习5 乘法的初步认识、1~4的乘法口诀
1.直接写出得数.
27+49= 34-17= 45+25= 57-30=
33+29= 74-52= 66+27= 95-49=
1×4= 2×3= 3×3= 4×4=
2×2= 2×4= 1×2= 3×1=
2×1= 4×1= 4×3= 4×2=
9+61+20= 76-46+12= 99-25-23= 36+30-40=
87-37+40= 33-33+33= 65+35-50= 10+18+12=
33+22+35= 45-20+24= 72-12+9= 18+32-5=
2.用竖式计算.
26+17+48 49-32+18 90-28-17 45-27+36
41-29+9 56+17-24 68+15-34 23+49-26
3.列竖式计算.
77-46-24 61+12-37 52+34-68 54-28+16
60-49+28 15-6+36 73-40+20 20+36-17
5
练习6 5~6的乘法口诀
1.直接写出得数.
1×4= 2×3= 3×3= 4×4=
2×6= 2×4= 5×2= 3×6=
2×1= 5×1= 4×3= 4×2=
3×5+5= 4×2+7= 2×2+5= 4×4-15=
2×6+17= 3×5-10= 5×5-12= 6×4+16=
9+61+20= 76-46+12= 99-25-23= 36+30-40=
57-37+40= 58-26+28= 47+47-50= 18+18+12=
69-20+37= 83-20-35= 67-8+16= 58-26+12=
2.直接写出得数.
5×4= 2×6= 3×3= 4×4=
2×3= 2×5= 4×2= 3×4=
2×2= 5×1= 1×3= 4×2=
4×5+15= 4×4+7= 6×2+25= 3×3+15=
2×3+12= 3×6-10= 5×6-12= 5×4+16=
19-11+20= 76-40+12= 50+25-23= 36+33-40=
59-26+33= 58-16-22= 67-42+50= 58-18-12=
66+23-70= 50+23-48= 44+30-70= 72-50+10=
3.直接写出得数.
5×6= 3×6= 6×6= 5×4=
5×2= 4×5= 4×6= 4×3=
6×2= 6×1= 5×3= 2×6=
3×5+15= 4×6+26= 5×2+55= 6×3+12=
6×3+30= 5×6-10= 6×6-22= 5×4+80=
39-25+18= 47-40+56= 30+25-25= 48+22-70=
57-27+19= 100-50-30= 47-42+68= 77-37+20=
56-16+20= 22+18-17= 99-19-30= 100-20-50=
6
练习7 练习课
1.直接写出得数.
33+12= 66-27= 19+55-12= 75-9+10=
52+26= 88-54= 65+22+13= 47-29+1=
3×3= 2×2= 3×1= 2×1=
4×6= 1×4= 5×2= 3×6=
5×3= 4×5= 2×6= 3×2=
3×3+6= 5×6-12= 3×6+12= 5×3-13=
6×4-8= 4×4+70= 2×5-10= 2×4-4=
6×2+6= 3×2+58= 3×5+17= 2×2+5=
2.直接写出得数.
22+16= 56-8= 34-30+55= 22+27+12=
75-23= 16+14= 22+66-33= 49-2+15=
6×3= 3×3= 4×1= 4×4=
2×3= 5×4= 3×2= 1×4=
5×3= 2×4= 2×2= 6×2=
3×2+8= 5×5-14= 5×4+17= 3×2+24=
6×2+12= 4×5+22= 3×4+10= 6×2+18=
5×3+40= 3×1+22= 3×6-14= 4×2+32=
3.直接写出得数.
30+38= 37+17= 39+52-40= 85+7-23=
75-58= 54-45= 80-48-32= 75+25-26=
6×5= 6×3= 4×4= 3×3=
4×3= 6×4= 6×1= 2×4=
5×3= 5×4= 5×5= 2×2=
6×2+18= 6×5-25= 5×4+32= 6×2+88=
3×3+77= 5×5+25= 6×4+25= 5×2+78=
6×3+35= 4×1+72= 6×6-14= 3×2+32=
7
练习8 认识平均分
1.直接写出得数.
48+12= 77-27= 20+55-30= 85-25+10=
25+55= 68-54= 65+15+20= 79-29+15=