Times Market — Lesson 84: The 6 table and the 7 table
The 8 table and the 9 table →Lesson 84: Abacus times tables: 6 and 7
Level 7, Times Market. Adding 6 again and again: you know every move.
What your child does, card by card
The 6 table and the 7 table. Count by 6. Then count by 7. PlayType opens the lesson: “Now let's try a harder one.”
Watch me: 6, 7, 2, 12, 18, 19, 14, 24, 20 and 30 appear on the beads one move at a time, each bead ringed in green before it goes. Plus 6 each time. Watch which friend helps.
Try it puts a green ring on each next bead; your child works out 10 × 6.
7, 14, 21, 28, 35: the abacus makes 7, 9, 4, 14, 11, 21, 28, 25 and 35 by itself, a green ring on each bead just before it moves, and the sum sheet below ticks each line. Plus 7 each time.
In Try it a green ring marks the next bead while your child works out 10 × 7.
The tiny practice drops the ring: work out 4 × 6, 5 × 7, 8 × 6, 7 × 7 and 9 × 6, each round starting from its own number.
Then the beads hide and the sums 6 × 6, 3 × 7 and 7 × 6 are done in the head, the answer picked from 21, 36 and 42.
You're ready! You can count by 6 and by 7.
What this lesson trains
About five minutes and 18 answers. Altogether the child makes 38 bead moves (13 with the top bead, 25 with bottom beads). Numbers reach 70, so the tens rod and the ones rod work. Then 3 quick looks in your head. Friends do 7 of the 15 sums, by +6 = +1 −5 +10, +6 = −4 +10, +7 = +2 −5 +10 and +7 = −3 +10.
It starts with doing: work out 10 × 6.
The sum sheet
The lower window shows the column as a child would write it on paper: one number under another, the current line in yellow, ticks on the lines done. The abacus carries the running total from line to line.
What PlayBuddy and PlayType say
PlayType: “Now let's try a harder one.”
PlayBuddy: “Click Let's Begin, or press Enter!”
PlayType: “Now watch the beads closely.”
PlayBuddy: “Here comes the last one.”
Stars
18 answers: 1 slip still gives three stars; up to 4, two stars.