MATH 2 Unit Review Number Sense Grade s2

Grade 2 Unit Test Reviewer

1. MATH Unit Review

2. Visualizing and Identifying Numbers from 101 to 1,000 To visualize and identify numbers from 101 to 1,000, represent the numbers by objects and counting object, then by one hundreds, tens and ones.

3. Visualizing and Identifying Numbers from 101 to 1,000 To visualize numbers, we use symbols and each symbols represents the value of the numbers. 1,000 100 10 1

4. 1,000 100 10 1 1,000 1,000 1,000 1,000 100 100 1 1 5,313

5. 1,000 100 10 1 1,000 100 100 1 2,622 100 100 100 10

6. 100 10 100 100 1 671 100 100 100 10 10 10 10 10 10

7. Place Value and Value of Each Digit in a 3-digit Number Place value tells the position of the digits in a given 3-digits, then the place values are one, tens, and hundreds.

8. In determining the place value, start from the right digit, which is the ones, and then move to the left to the hundreds. Example: 123 Hundreds Tens Ones 1 2 3

9. Identify the place value of the underlined digit. 1 9 5 = 27 8 = 4 42 = 7 8 2 = 9 71 = tens ones hundreds hundreds tens

10. In identifying the value of each digit, always refer to the place value of the digits. The value in the hundreds is 100 , for tens is 10 and for ones is 1 . Hundreds Tens Ones 1 2 3 100 20 3

11. Identify the value of the underlined digit. 1 9 5 = 27 8 = 4 42 = 7 8 2 = 9 71 = 90 8 400 900 80

12. Writing Three-Digit Numbers in Expanded Form Numbers can be written or expressed in expanded form using the place value and the value of each digit. Express it as a sum of the values of each digit.

13. Identify the value of each digit in their place value. Example: 456 Hundreds Tens Ones 4 5 6 400 50 6 Expanded Form = 400 + 50 + 6

14. Write the expanded form of the number. 962 = 815 = 381 = 697 = 534 = 900 + 60 + 2 800 + 10 + 5 300 + 80 + 1 600 + 90 + 7 500 + 30 + 4

15. Reading and Writing Numbers from 101 to 1,000 in Symbols and in Words. Numbers can be expressed or written in symbols and in words. Symbols Words 978 Nine hundred seventy-eight

16. Numbers 1 one 11 eleven 30 thirty 2 two 12 twelve 40 forty 3 three 13 thirteen 50 fifty 4 four 14 fourteen 60 sixty 5 five 15 fifteen 70 seventy 6 six 16 sixteen 80 eighty 7 seven 17 seventeen 90 ninety 8 eight 18 eighteen 100   hundred 9 nine 19 nineteen 10 ten 20 twenty

17. Write this number into words. 587 Five hundred eighty-seven

18. Comparing Numbers We compare numbers based on the value of the highest place value. Greater than (>) Less than (<) Equal to (=)

19. Steps in comparing numbers: 1. Count all of the digits of the number. 2. Align the numbers from the ones place value. 3. Compare the first digit of the two numbers from left to right. 4. If the first digits of the two numbers are the same, compare to the next digit to the right until you found their differences.

20. Steps in comparing numbers: 1. Count all of the digits of the number. 6,556 656 >

21. Steps in comparing numbers: 1. Count all of the digits of the number. 882 828

22. Steps in comparing numbers: 2. Align the numbers from the ones place value. 882 828

23. Steps in comparing numbers: 3. Compare the first digit of the two numbers from left to right. 882 828

24. Steps in comparing numbers: 4. If the first digits of the two numbers are the same, compare to the next digit to the right until you found their differences. 882 828

25. 882 828 > Think of the signs like the mouth of an alligator. The alligator is greedy and always eats the larger number .

26. Write < > or = 176 189 <

27. Write < > or = 367 123 >

28. Write < > or = 354 354 =

29. Ordering Numbers Ordering numbers is putting numbers in a given order, either from Greatest to Least or from Least to Greatest .

30. Ordering Numbers Greatest to Least – arranging numbers from the biggest number to the smallest number. 536, 227, 126

31. Ordering Numbers Least to Greatest – arranging numbers from the smallest number to the biggest number. 572, 671, 947

32. Arrange the following numbers from Least to Greatest by writing the correct order. 572 , 671 , 947, 731 1 2 3 4 1 2 4 3

33. Arrange the following numbers from Greatest to Least by writing the correct order. 572 , 671 , 947, 731 1 2 3 4 3 4 2 1

34. REMEMBER: In arranging the numbers from Greatest to Least or Least to Greatest, always start writing the first number on the left .

35. Ordinal Numbers Ordinal Numbers - These are number that tell the position of the objects in a given set. It is determined by where the object is, using the point of reference. Point of References: Left to Right Right to Left

36. Steps in identifying the ordinal number or position of the items in the given set. 1. Determine first the given point of reference. 2. Count the items based on the given point of reference (left to right/right to left). 3. Identify the position of the item based on how you count the items using their point of reference.

37. Identify the position of the underlined letter from left to right. A, B, C, D, E, F, G, H, I, J, K, L , M, N, O, P, Q, R, S, T 1. Determine first the given point of reference. 2. Count the items based on the given point of reference.

38. Identify the position of the underlined letter from left to right. A, B, C, D, E, F, G, H, I, J, K, L , M, N, O, P, Q, R, S, T 3. Identify the position of the item based on how you count the items using their point of reference. L = 12th

39. From left to right, what is the position of the bee that is carrying honey? 10th

40. From left to right, what is the fruit in the 16th position? Jackfruit

41. From right to left, what is the fruit in the 13th position? Avocado