b. Multiplication tables. Review tables already studied. Teach 7 and 9.
c. Drill in recognizing sum of three numbers at a glance; review combinations already learned; 20 new ones.
2. Devices.
a. Combination cards, large and small.
b. Wheels.
c. Chart for addition and subtraction.
d. Fraction chart.
e. Miscellaneous drill cards.
f. Pack of “three” combination cards.