PART III

ARITHMETIC

I. ARITHMETICAL OPERATIONS 205 Numbers 1-10 205 Tens, Hundreds and Thousands 208 Counting-frames 210

II. THE MULTIPLICATION TABLE 217

III. DIVISION 223

IV. OPERATIONS IN SEVERAL FIGURES 225 Addition 225 Subtraction 227 Multiplication 228 Multiplying on Ruled Paper 235 Long Division 237

V. EXERCISES WITH NUMBERS 241 Multiples, Prime Numbers and Factoring 241

VI. SQUARE AND CUBE OF NUMBERS 251