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Specific Tricks

Level 6 / foundation

Complementary ones (hard, tens 7-9)

3 visual steps / complementary ones product

1. Ones make ten

78 x 721. Ones make tenConfirm the ones add to ten.18 + 2 = 1027 x 8 = 563append 16 -> 5616
Confirm the ones add to ten.

Confirm the ones add to ten.

2. Prefix product

78 x 722. Prefix productMultiply tens by next tens.18 + 2 = 1027 x 8 = 563append 16 -> 5616
Multiply tens by next tens.

Multiply tens by next tens.

3. Append ones

78 x 723. Append onesAppend the ones product.18 + 2 = 1027 x 8 = 563append 16 -> 5616
Append the ones product.

Append the ones product.

Practice Level 6

Name the shape first; the shortcut stays small.

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