Explicação passo-a-passo:
a) 800+50= 850
b) 500+70= 570
c) 4000+600+90= 4600+90= 4690
A)
[tex]\large\sf{}\left(8 \times 100\right) + \left(5 \times 10\right) \\ \large\sf{}800 + \left(5 \times 10\right) \\ \large\sf{}800 + 50 \\ \blue{ \bm{\large\boxed{\boxed{ { \large \sf 850}}}}}[/tex]
B)
[tex]\large\sf{}\left(5 \times 100\right) + \left(7 \times 10\right) \\ \large\sf{}500 + \left(7 \times 10\right) \\ \large\sf{}500 + 70 \\ \red{\bm{\large\boxed{\boxed{ { \large \sf 570}}}}}[/tex]
C)
[tex]\large\sf{}\left(4 \times 1000\right) + \left(6 \times 100\right) + \left(9 \times 10\right) \\ \large\sf{}4000 + \left(6 \times 100\right) + \left(9 \times 10\right) \\ \large\sf{}4000 + 600 + \left(9 \times 10\right) \\ \large\sf{}4000 + 600 + 90 \\ \large\sf{}4.600 + 90 \\ \orange{ \bm{\large\boxed{\boxed{ { \large \sf 4.690}}}}}[/tex]
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Explicação passo-a-passo:
a) 800+50= 850
b) 500+70= 570
c) 4000+600+90= 4600+90= 4690
A)
[tex]\large\sf{}\left(8 \times 100\right) + \left(5 \times 10\right) \\ \large\sf{}800 + \left(5 \times 10\right) \\ \large\sf{}800 + 50 \\ \blue{ \bm{\large\boxed{\boxed{ { \large \sf 850}}}}}[/tex]
B)
[tex]\large\sf{}\left(5 \times 100\right) + \left(7 \times 10\right) \\ \large\sf{}500 + \left(7 \times 10\right) \\ \large\sf{}500 + 70 \\ \red{\bm{\large\boxed{\boxed{ { \large \sf 570}}}}}[/tex]
C)
[tex]\large\sf{}\left(4 \times 1000\right) + \left(6 \times 100\right) + \left(9 \times 10\right) \\ \large\sf{}4000 + \left(6 \times 100\right) + \left(9 \times 10\right) \\ \large\sf{}4000 + 600 + \left(9 \times 10\right) \\ \large\sf{}4000 + 600 + 90 \\ \large\sf{}4.600 + 90 \\ \orange{ \bm{\large\boxed{\boxed{ { \large \sf 4.690}}}}}[/tex]