Multiply (Level 1)

This math topic focuses on practicing matrix multiplication. It involves several problems that require multiplying matrices of various sizes and orders, providing multiple answer choices per question possibly including correct results, incorrect configurations, and formatted results without values. The problems progress in complexity and challenge students to correctly perform matrix operations, emphasizing the multiplication rules such as conformability for matrix dimensions and systematic computation of entries through dot products of rows and columns from respective matrices.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

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Matrices - Multiply Worksheet

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Math worksheet on 'Matrices - Multiply (Level 1)'. Part of a broader unit on 'Matrices' Learn online: app.mobius.academy/math/units/matrices/
1
A LaTex expression showing X = \left[ {\begin{array} {ccc} 1 & 1 & 4 \\ 2 & 1 & 1 \\ 0 & 4 & 2 \end{array} } \right]\\Y = \left[ {\begin{array} {} \end{array} } \right]
Find the resulting matrix for X x Y
a A LaTex expression showing undefined
b A LaTex expression showing \left[ {\begin{array} {cccccc} 1 & 1 & 4 \\ 2 & 1 & 1 \\ 0 & 4 & 2 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end{array} } \right]
2
Find the resulting matrix for D x Y
A LaTex expression showing D = \left[ {\begin{array} {cc} 4 & 6 \\ 8 & 7 \end{array} } \right]\\Y = \left[ {\begin{array} {} \end{array} } \right]
a A LaTex expression showing undefined
b A LaTex expression showing \left[ {\begin{array} {cccc} 4 & 6 \\ 8 & 7 \\ 0 & 0 \\ 0 & 0 \end{array} } \right]
c A LaTex expression showing \left[ {\begin{array} {cc} 4 & 6 & 0 & 0 \\ 8 & 7 & 0 & 0 \end{array} } \right]
3
Find the resulting matrix for D x X
A LaTex expression showing D = \left[ {\begin{array} {ccc} 4 & 2 & 2 \\ 9 & 8 & 8 \\ 4 & 0 & 0 \end{array} } \right]\\X = \left[ {\begin{array} {} \end{array} } \right]
a A LaTex expression showing undefined
b A LaTex expression showing \left[ {\begin{array} {cccccc} 4 & 2 & 2 \\ 9 & 8 & 8 \\ 4 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end{array} } \right]
c A LaTex expression showing \left[ {\begin{array} {ccc} 4 & 2 & 2 & 0 & 0 & 0 \\ 9 & 8 & 8 & 0 & 0 & 0 \\ 4 & 0 & 0 & 0 & 0 & 0 \end{array} } \right]
4
Find the resulting matrix for X x C
A LaTex expression showing X = \left[ {\begin{array} {ccc} 8 & 4 & 0 \\ 6 & 7 & 6 \\ 3 & 3 & 9 \end{array} } \right]\\C = \left[ {\begin{array} {} \end{array} } \right]
a A LaTex expression showing undefined
b A LaTex expression showing \left[ {\begin{array} {cccccc} 8 & 4 & 0 \\ 6 & 7 & 6 \\ 3 & 3 & 9 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end{array} } \right]
c A LaTex expression showing \left[ {\begin{array} {ccc} 8 & 4 & 0 & 0 & 0 & 0 \\ 6 & 7 & 6 & 0 & 0 & 0 \\ 3 & 3 & 9 & 0 & 0 & 0 \end{array} } \right]
5
Find the resulting matrix for X x P
A LaTex expression showing X = \left[ {\begin{array} {cc} 0 \\ 7 \end{array} } \right] \;\; P = \left[ {\begin{array} {c} 9 & 6 & 8 \end{array} } \right]
a A LaTex expression showing \left[ {\begin{array} {cc} 1 & 8 & 3 \\ 9 & 9 & 3 \end{array} } \right]
b A LaTex expression showing \left[ {\begin{array} {cc} 0 & 9 \\ 7 & 0 \end{array} } \right]
c A LaTex expression showing \left[ {\begin{array} {cc} 3 & 2 & 9 \\ 2 & 1 & 7 \end{array} } \right]
d A LaTex expression showing \left[ {\begin{array} {c} 5 \end{array} } \right]
e A LaTex expression showing \left[ {\begin{array} {cc} 0 & 0 & 0 \\ 63 & 42 & 56 \end{array} } \right]
f A LaTex expression showing \left[ {\begin{array} {cc} 4 & 7 & 2 \\ 5 & 6 & 2 \end{array} } \right]
6
A LaTex expression showing P = \left[ {\begin{array} {} \end{array} } \right]\\M = \left[ {\begin{array} {cc} 1 & 6 & 0 \\ 0 & 3 & 3 \end{array} } \right]
Find the resulting matrix for P x M
a A LaTex expression showing \left[ {\begin{array} {} \end{array} } \right]
b A LaTex expression showing undefined
7
Find the resulting matrix for X x P
A LaTex expression showing X = \left[ {\begin{array} {c} 9 & 2 \end{array} } \right]\\P = \left[ {\begin{array} {cc} 6 & 9 & 2 \\ 9 & 3 & 4 \end{array} } \right]
a A LaTex expression showing \left[ {\begin{array} {cc} 9 & 2 \\ 6 & 9 \end{array} } \right]
b A LaTex expression showing \left[ {\begin{array} {c} 8 & 3 & 5 \end{array} } \right]
c A LaTex expression showing \left[ {\begin{array} {c} 72 & 87 & 26 \end{array} } \right]
d A LaTex expression showing \left[ {\begin{array} {c} 9 & 2 & 6 & 9 \end{array} } \right]
e A LaTex expression showing undefined
f A LaTex expression showing \left[ {\begin{array} {cc} 4 & 1 \\ 3 & 5 \end{array} } \right]