Dice Sums

Objectives - To investigate sums generated by rolling pairs of dice

1 Teaching the Lesson

Children roll pairs of dice and record the sum of the dots. They observe which sums occur most often (Operations and Computation; Data and Chance)

• Math Journal 1, p. 116

• Home Link 5.8

• Class Number Grid Poster

• dice

2 Ongoing Learning & Practice

Children find differences between pairs of numbers represented by base-10 blocks. (Numeration; Operations and Computation)

Children practice and maintain skills through
Math Boxes and Home Link activities.

• Math Journal 1, p. 117, 118; and 96 (optional)

• Home Link Master (Math Masters, p. 226)

• base-10 blocks (optional)

3 Options for Individualizing

Extra Practice- Children practice finding sums by completing a color-by-number picture [Operations and Computation]

• Teaching Masters (Math Masters, pp. 70)

Additional Information

Vocabulary · multiple of 10

Mental Math and Reflexes

Begin to practice place-value and rounding skills. Have children write their answers on their slates.

Is 18 closer to 10 or 20? 20 · Is 12 closer to 10 or 20? 10 · Is 19 closer to 10 or 20? 20

Explain to the class that the numbers 10, 20, 30, ... are called multiples of 10. Ask someone to point to the multiples of 10 on the Class Number Grid Poster. Discuss what they have in common. They all end in 0. They are all in the last column on the right.
Ask children to count spaces on their number grids to help them answer the following questions on their slates.
· Is 27 closer to 20 or 30? 30 ·Is 54 closer to 50 or 60? 50 ·Is 86 closer to 80 or 90? 90

To extend the activity, ask the following: Is there a way to solve problems like these by just looking at the numbers? Look at the ones digit. If the ones digit is less than 5, the number is closer to the smaller number. If it is more than 5, the number is closer to the larger number. If it is 5, the number is halfway between the smaller and larger number.

1 + 6 = _____
2 + 5 = _____
_____= 3 + 4
_____= 4 + 3
5 + 2 = _____
_____= 6 + 1

Briefly go over the answers. Ask several volunteers to tell their number stories and have the class solve them. Share solution strategies for the problems.