Unit: Adding and Subtracting
BIG IDEAS:
(taken from “Big Ideas by Dr. Small”):
- A personal “invented” algorithm is often more meaningful and sometimes equally efficient as a conventional algorithm.
- Decimals are an alternative representation to fractions, but one that allows for calculations that are consistent with whole numbers.
STUDENT LEARNING GOALS:
GOAL: I can use strategies to estimate sums and differences of decimal numbers.
- QUIZ: Adding and Subtracting using Mental Math
- QUIZ: Estimating Sums and Differences (Whole Numbers)
GOAL: I can add whole and decimal numbers.
- QUIZ: Adding Whole Numbers
- QUIZ: Adding Decimals
- QUIZ: Adding Money
- VIDEO: Adding Whole Numbers – with carrying (4 videos, 2 practice quizzes)
- VIDEO: Adding Decimals (3 videos, 3 practice quizzes)
- GAME: Math Soccer
- GAME: Hungry Puppies
- GAME: Decimal Addition – Matching
- GAME: Bubble Burst
GOAL: I can subtract whole and decimal numbers.
- QUIZ: Making Change
- QUIZ: Subtracting Decimals
- VIDEO: Subtracting Whole Numbers – with borrowing (12 videos, 2 practice quizzes)
- VIDEO: Subtracting Decimals (2 videos, 3 practice quizzes)
- GAME: Hotel Decimalfornia
- GAME: Hoop Shoot
- GAME: Decimal Subtraction – Matching
CURRICULUM EXPECTATIONS:
- add and subtract decimal numbers to hundredths, including money amounts, using concrete materials, estimation, and algorithms (e.g., use 10 x 10 grids to add 2.45 and 3.25);
- solve problems involving the addition and subtraction of whole numbers, using a variety of mental strategies;
- use estimation when solving problems involving the addition and subtraction to help judge the reasonableness of a solution;