Times Market — Lesson 88: Bigger products: 47 times 6
Times practice: two-digit by one-digit →Lesson 88: Abacus multiplication: bigger products
Level 7, Times Market. Bigger parts, the same way. Adding the parts may need a friend.
What your child does, card by card
Bigger products: 47 times 6. 240 + 42: the parts need friends. PlayBuddy opens the lesson: “Big part first, then the small part.”
40 × 6 = 240: 4 × 6 = 24. One rod to the left: 240. The beads work the column line by line, zero and 240, while the sum sheet below lights each line and ticks it; “4 × 6 = 24” and “40 × 6 = 240” light up as the total grows. 24 tens are 2 hundreds and 4 tens.
47 × 6: the abacus makes 200, 240, 290, 280 and 282 by itself, a green ring on each bead just before it moves, and the sum sheet below ticks each line. 40 × 6 is 240. 7 × 6 is 42. Together: 282.
In Try it a green ring marks the next bead while your child works out 42 × 3, 38 × 7 and 56 × 4.
The tiny practice drops the ring: work out 29 × 6, 64 × 8, 75 × 9 and 87 × 5, each round starting from its own number.
Then the beads hide and the sums 40 × 6, 70 × 3 and 60 × 5 are done in the head, the answer picked from 210, 240 and 300.
You're ready! Bigger products, part by part.
What this lesson trains
About five minutes and 17 answers. Altogether the child makes 33 bead moves (11 with the top bead, 22 with bottom beads). The largest is 675: hundreds, tens and ones. Then 3 quick looks in your head. 2 of the 14 sums need a friend (“+3 = −7 +10” and “+4 = +5 −1”); the others use free beads.
Your child’s first moves: work out 42 × 3, 38 × 7 and 56 × 4.
The sum sheet
Below the abacus a sum sheet replaces the hands: it writes the column out, lights the line your child is on and ticks each line done; the total appears after the last line. The beads hold the running total the whole way down.
What PlayBuddy and PlayType say
PlayBuddy: “Big part first, then the small part.”
Stars
Three stars for up to 1 slip in 17 answers, two stars for up to 4.