How to calculate a picture by multiplication
(for reference)
Integer vertical multiplication exercises
21x45=
35x25=
66x16=
76x78=
87x89=
123x456=
123x543=
87x45=
321x98=
876x8=
87x111=
12x123=
65x98=
109x101=
12x101=
92x120=
143x12=
101x102=
98x12=
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