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Specific Tricks

Level 4 / foundation

Complementary ones (easy, tens 1-3)

3 visual steps / complementary ones product

1. Ones make ten

23 x 271. Ones make tenConfirm the ones add to ten.13 + 7 = 1022 x 3 = 63append 21 -> 621
Confirm the ones add to ten.

Confirm the ones add to ten.

2. Prefix product

23 x 272. Prefix productMultiply tens by next tens.13 + 7 = 1022 x 3 = 63append 21 -> 621
Multiply tens by next tens.

Multiply tens by next tens.

3. Append ones

23 x 273. Append onesAppend the ones product.13 + 7 = 1022 x 3 = 63append 21 -> 621
Append the ones product.

Append the ones product.

Practice Level 4

Name the shape first; the shortcut stays small.

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