correction des exercices facultatifs du 4/05/2014

Pour les ce2
a)87 x 6= (80 + 7 ) x 6
" = ( 80 x 6 ) + ( 7 x 6 )
" = 480 + 42
87 x 6 = 522

b) 98 x 7 = (90 + 8 ) x 7
" = ( 90 x 7 ) + ( 8 x 7 )
" = 630 + 56
98 x 7 = 686

c) 65 x 9 = (60 + 5 ) x 9
" = ( 60 x 9 ) + ( 5 x 9 )
" = 540 + 45
65 x 9 = 585

d) 76 x 8 = (70 + 6 ) x 8
" = ( 70 x 8 ) + ( 6 x 8 )
" = 560 + 48
76 x 8 = 608

e) 59 x 5 = (50 + 9 ) x 5
" = ( 50 x 5 ) + ( 9 x 5 )
" = 250 + 45
59 x 5 = 295

pour les ce1
a)19 x 3 = (10 + 9 ) x 3
" = ( 10 x 3 ) + ( 9 x 3 )
" = 30 + 27
19 x 3 = 57

b) 25 x 4= (20 + 5 ) x 4
" = ( 20 x 4 ) + ( 5 x 4 )
" = 80 + 20
25 x 4 = 100

c) 37 x 5 = (30 + 7 ) x 5
" = ( 30 x 5 ) + ( 7 x 5 )
" = 150 + 35
37 x 5 = 185

d) 48 x 2 = (40 + 8 ) x 2
" = ( 40 x 2 ) + ( 8 x 2 )
" = 80 + 16
48 x 2 = 96

e) 54 x 4 = (50 + 4 ) x 4
" = ( 50 x 4 ) + ( 4 x 4 )
" = 200 + 16
54 x 4 = 216

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