6 x 99 Think: round off 99 to 100 So… 6 x 99 becomes 6 x 100 = 600 Then subtract: 600 – 6 = 594 4 x 79 4 x 80 = 320 – 4 = 316.

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Presentation transcript:

6 x 99 Think: round off 99 to 100 So… 6 x 99 becomes 6 x 100 = 600 Then subtract: 600 – 6 = x 79 4 x 80 = 320 – 4 = 316

1)8 x 79 = 2) 8 x 199 = 3) 5 x 599 = 4) 7 x 39 = 5) 3 x 2999 = 6)6 x 59 = )5 x 299 = 2)9 x 69 = 3)4 x 499 = 4)8 x 199 = 5)7 x = 6)2 x =

1)7 x 29 = 2)6 x 499 = 3) 3 x 899 = 4) 4 x 49 = 5) 2 x = 6) 8 x 199 = 1)6 x 59 = 2) 3 x = 3) 4 x 79 = 4) 9 x 299 = 5) 8 x = 6) 7 x =