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Specific Tricks

Level 12 / build-up

Near-100 mul (mixed sides)

3 visual steps / near-base product

1. Left side

98 x 1041. Left sideCross-adjust once from the base.1left side 98 + 4 = 1022right side -2 x 4 = -83answer borrow: 101|92
Cross-adjust once from the base.

Cross-adjust once from the base.

2. Right side

98 x 1042. Right sideMultiply offsets for padded digits.1left side 98 + 4 = 1022right side -2 x 4 = -83answer borrow: 101|92
Multiply offsets for padded digits.

Multiply offsets for padded digits.

3. Read answer

98 x 1043. Read answerBorrow if the right side is negative. Read answer answer borrow: 101|92Borrow if the right side is negative.
Borrow if the right side is negative.

Borrow if the right side is negative.

Practice Level 12

Name the shape first; the shortcut stays small.

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