6. Ecris chaque multiplication sous la forme d'une addition répétée. Détermine chaque somme à l'aide de carreaux de couleur. a) (+7)times (-4) b) (+6)times (+3) c) (+4)times (+6) d) (+5)times (-6)

## Step 1: Representing Multiplication as Repeated Addition<br />### We can represent multiplication as repeated addition. For example, $a \times b$ means adding 'a' to itself 'b' times. If 'b' is negative, it means subtracting 'a' 'b' times.<br /><br />## Step 2: Calculating (a) $(+7) \times (-4)$<br />### This means subtracting +7 four times: $-7 - 7 - 7 - 7 = -28$.<br /><br />## Step 3: Calculating (b) $(+6) \times (+3)$<br />### This means adding +6 three times: $6 + 6 + 6 = 18$.<br /><br />## Step 4: Calculating (c) $(+4) \times (+6)$<br />### This means adding +4 six times: $4 + 4 + 4 + 4 + 4 + 4 = 24$.<br /><br />## Step 5: Calculating (d) $(+5) \times (-6)$<br />### This means subtracting +5 six times: $-5 - 5 - 5 - 5 - 5 - 5 = -30$.