This is an activity I created to use with two grade 2 classes that I work with at Charlie Lake Elementary. In BC, grade two students work **extensively with numbers to 100**. The activity, like “How many more to make 20?” (see post from Feb. 5, 2013), is **based on one of the foundational number relationships which is, for numbers 1 to 10,** **anchoring each number to 10**.

30 was chosen as the focal point for this activity since multiples of 10 are also important anchoring numbers.

Once again I was delighted to put some special dice to use, in this case **30-sided dice**.** Each child rolled the dice and then, using a set of 10 frames, created the number rolled at the top of the sheet, right over the blank ten frames there. Thus, if 14 were rolled, the child placed a full ten frame and a one showing four on the paper, and then recorded the number 14 in the roll column of the T-chart. Then he looked to see how many would be needed to make 30, in this case 6 to fill the partial ten frame and one more full ten. 16 was recorded beside 14 on the T-chart (see picture).

Similarly, if 7 were rolled, the child placed a ten frame showing seven on the paper, and then recorded the number 7 in the roll column of the T-chart. He could see that to make 30 he would need 3 more to fill the partial ten frame and two more full 10 frames, and thus 23 was recorded on the T-chart (see picture).

As in the “How many more to make 20?” activity, some of the children stopped making the numbers with their ten frames soon into the activity. Clearly **they could imagine the anchoring relationship in their minds** and did not need to manipulate the cards to “see” the numbers. Other children needed the support for every roll, but** they were still able to be successful because of the scaffolding the ten frames provided.**

** **

I hope you will try the activity with your students!

Mathematically yours,

Carollee

Download the recording page here.

**If you do not have 30-sided dice, having students draw numbers from a bag or spinning numbers on a spinner will do nicely. You could even give students the page with the first column already filled in with numbers of your choice.

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