Double-Double Strategy When Multiplying By 4

When multiplying by 4 you can use the strategy of double-double. For example, if the problem was 4 x 15, you double 15 (30) and then double 30, which equals 60.

Try solving some of these by using the double-double strategy and post your working out and answers in a comment under this post.

1) 4 x 18
2) 4 x 34
3) 4 x 62
4) 4 x 223

6 thoughts on “Double-Double Strategy When Multiplying By 4

  1. 1) 4×18 = 72
    (18×2=36) (36×2=72)
    2) 4×34 = 36
    (34×2=68) (68×2=136)
    3)4×62 = 248
    (62×2=124) (124×2=248)
    4)4×223 = 932
    (233×2=466) (466×2=932)

  2. 4×18=72 18+18=36 36+36=72
    4×34= 136 34+34=68 68+68=136
    4×62=248 62+62=124 124+124=248
    4×223=892 223+223=446 446+446=892

  3. 18×4=72 18×2=36 36×2=72 Therefor 18×4=72.
    4×34=136 34×2=68 68×2=136 Therefor 4×34=136.
    4×62=248 62×2=124 2×124=248 Therefor 4×62=248.
    4×223=892 223×2=446 446×2=892 Therefor 4×233=892.

  4. 18×2=36 36×2=72: Answer 72
    2×34=68 2×68=136: Answer 136
    2×62=124 2×124=248: Answer 248
    2×223=446 2×446=892: Answer 892
    I used a piece of paper for the last 1.

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