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2152

ARITHMETIC

The facts of multiplication as found in the tables should be thoroughly memorized.

Have children add by numbers: as, 1, 14, 21, 28, etc., 9, 18, 27, 36, etc. Good drill,—

4X6+2      7X5—6

3X8+5      8X4—3 Method of work.

Multiply 428 by 536. 428 536

2568      428X6 units         =     2568 units 1284         428X3 tens          =   1284   tens

2140         428X5 hundreds = 2140     hundreds

229,408     428X536               = 229408 units

Place the right-hand figure of each partial product under the figure of the multiplier which produces it.

Multiply 4862 by 4006.

4862         "When there are ciphers in the multiplier it is not neces-

4006   sary to multiply by them. Keep in mind that the first figure

—-Of each partial product is to be written directly under the

29172   figure of the multiplier which produces it. This saves the 19448        work of writing the row of O's.

19,477,172

Multiply 482 by 10; 482 by 100.

482       482          If the multiplier is 10, annex one cipher to the mul-

10        100    tiplieand; if 100, annex 2 ciphers, etc.

4,820   48,200

The following drill will help fix in the mind the facts of the multiplication table.