Big Friends Bridge — Lesson 43: Plus 6, 7, 8 and 9 practice
Big friends: plus 5 →Lesson 43: Abacus plus 6 to plus 9 practice
Level 4, Big Friends Bridge. Fill the bead jar. Every right answer drops in a bead.
What your child does, card by card
Plus 6, 7, 8 and 9 practice. Practice day! PlayBuddy opens the lesson: “Practice time. Let's get quicker and better.”
Four big friends: one ten goes on every time. The beads show 9 and go back to zero. Here the hands lead: they show 9, 8, 18, 9, 7, 17, 9, 6, 16, 9, 5 and 15, and a moment later the beads copy each one. On the card, “+9: 1 off”, “+8: 2 off”, “+7: 3 off” and “+6: 4 off” light up one by one. Then the card invites a touch: “The less you add, the more comes off first.”
Try it: your child works out 3 + 9 and 4 + 7, with a green ring on the next bead to move.
Ten beads to go: a mission of 10 tasks with a bead jar that fills with every right answer. Your child must work out 1 + 9, 4 + 8, 3 + 7, 4 + 6, 8 + 9, 9 + 8, 8 + 7, 9 + 6, 2 + 9 and 7 + 8.
Copy me: the hand in the lower window shows 10, 15 and 13, one at a time, and your child makes the same number on the beads.
Then the beads hide and the sums 4 + 6, 8 + 7 and 3 + 9 are done in the head, the answer shown on the fingers.
Jar full! Plus 6, 7, 8 and 9 with the big friends.
What this lesson trains
18 answers in about five minutes. The tasks take 29 bead moves in all: 1 with a top bead and 28 with bottom beads. Numbers reach 17, so the tens rod and the ones rod work. Then 3 quick looks in your head. 12 of the 12 sums need a big friend (“+9 = −1 +10”, “+7 = −3 +10”, “+8 = −2 +10” and “+6 = −4 +10”); the others use free beads.
Your child’s first moves: work out 3 + 9 and 4 + 7.
Fingers and hands
Below the abacus the drawn hands show zero and 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17 and 18 here, finger for bead: the left hand counts the tens, the right hand the ones.
+9 on the fingers: the right hand lets 1 go and the left hand opens one more finger for the ten (−1 +10). +7 on the fingers: the right hand lets 3 go and the left hand opens one more finger for the ten (−3 +10). +8 on the fingers: the right hand lets 2 go and the left hand opens one more finger for the ten (−2 +10). +6 on the fingers: the right hand lets 4 go and the left hand opens one more finger for the ten (−4 +10).
On “Four big friends” the hands move first and the beads follow, so your child sees that a finger and a bead move together: open a finger and a bead goes to the bar, close it and the bead goes back.
In Copy me the hand leads with 10, 15 and 13 and your child turns each into beads.
What PlayBuddy and PlayType say
PlayType: “Big friend off, one ten on.”
Stars
Three stars for up to 1 slip in 18 answers, two stars for up to 4.