4 th Grade Math!

1. 4th Grade Math!

2. 105 15 When comparing numbers, feed the alligator the big one! < = > = < < > = < > < = > 105 > 15

3. Fractions show part of a whole! 1/8 of the pizza!

4. Some fractions can be equal even if the numbers look different! 2/4 = 1/2 It’s the same thing!!! =

5. The same number can wear many hats! 128 100+20+8 One hundred twenty-eight

6. 2 4 6 8 10 12 14 16 18 1 3 5 7 9 11 13 15 17 Numbers are even or odd! Even! Odd! You can divide these by 2!

7. MULTIPLES 2 x 6 = 12 2 rows and 6 columns

8. Hooray! Hooray! Sets and Arrays! * * * * * * * * * * * * 4 x 3 = 12 3 x 4 = 12 12/3 = 4 12/4 = 3 = SET! ARRAY!

9. 12 X 24 Don’t leave anyone out when multiplying! 4 8 2 4 0 + 2 8 8

10. Multiply = gets bigger! 4 . . . 2 times! 4 x 2 = * * * * * * * *

11. Divide = Break into smaller groups! * * * * * * * * * * * * 12 Divided into 3 groups * * * * * * * * * * * * = 4 per group 12 / 3 = 4!

12. Remember your family when dividing! Dad – divide Mom – multiply Sister – subtract Brother – bring down Rover - remainder

13. Estimate = educated guess! If I know this, then I can guess . . .

14. Rounding: Find your place, Look next door, Five or greater, Add one more! 107 - round to the nearest ten Next door place 7 is greater than 5 . . . Add one more! 110

15. Patterns: Can be numbers: 2,3,5,8,12,17 . . . 1,3,5,7,9,11,13 . . . Can be shapes:

16. Number Sentences/Expressions: 4+3=7 88/11 = 8 7-2=5 21/7 = 3 50 x 2 = 100 5+3-1=7 94 – 22 = 72

17. It’s the same thing! 4x3=12 3x4=12 5x3=15 3x5=15 You can switch the factors in multiplication and still get the same answer!

18. Graphs

19. Tables

20. Parallel Lines • Perpendicular lines

21. Cone Rectangular Prism Triangular Pyramid Rectangular Pyramid Cube Cylinder

22. Reflection = flip

23. Translation = slide

24. Rotation = turn

25. Directions: Right Left Forward Back Never eat soggy waffles!

26. Two in one! Two shapes can be put together to make a different shape!

27. Symmetry

28. Flat on your face! A shape’s faces are flat! This shape has 6 faces, you even count the ones you can’t see!

29. Perimeter – add the edges Perimeter = 28 inches

30. Area – Multiply length and width 8 in. long 4 in. tall Area = 8 (length) x 4 (width) = 32 square inches

31. Say What? in. = inches ft. = foot/feet yd. = yard m = meter cm = centimeter km = kilometer mm = millimeter

32. Huh? lbs. = pounds oz. = ounces c = cup qt. = quart gal = gallon g = gram kg = kilogram

33. Measurements • Door – feet • Football field – yards • Nail or pencil – inches • School to house – miles • glass of water – oz. • Milk jug – gallons • Eye dropper – milliliters • Soda bottle – liters • Quart - oil • Pint – ice cream • Paper clip – oz. • Baby – lbs. • Elephant – tons • Grams • Kilograms • Cup • kilometers

34. What time is it? 60 min. or 1 hr. 5 55 10 15 50 45 20 40 35 25 30

35. Line ‘em up! 1.42 .2 1.62 + When adding or subtracting decimals, be sure to line up your points!

36. Equal Measurements: • 12 inches = 1 ft. etc

37. Angles 0 degrees = 45 degrees = 90 =

38. Kinds of angles Obtuse Right Acute

39. Dude . . . Know your data lingo! Range = BIGGEST - smallest MOde = MOst often OUTlier = OUT on its own Median = Middle Mean = average + then /