1.NBT.2
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
| 1. | How many buses? Choose correct numeral | |
| 2. | Numbers Break-Up: 25=20+? | |
| 3. | Numbers Break-Up: 27 = 20 and ? | |
| 4. | Numbers Break-Up: 24 = 20 and ? | |
| 5. | Numbers Break-Up! 29 = 20 + ? | |
| 6. | Numbers Break-Up! 26 = 20 + ? | |
| 7. | Numbers Break-Up! 38 = ? + 8 | |
| 8. | Numbers Break-Up! 44 = ? + 4 | |
| 9. | Numbers Break-Up! 51 = 50 + ? | |
| 10. | Numbers Break-Up! 37 = ? + 7 | |
| 11. | Bring More Blocks: 2 tens, 6 ones | |
| 12. | Bring More Blocks: 2 tens, 5 ones | |
| 13. | Bring More Blocks: 1 ten, 7 ones | |
| 14. | Bring More Blocks: 1 ten, 8 ones | |
| 15. | Bring More Blocks: 2 tens, 9 ones | |
| 16. | Make a Number! 9 ones, 5 tens | |
| 17. | Make a Number! 1 ten, 4 ones | |
| 18. | Make a Number! 0 ones, 2 tens | |
| 19. | Make a Number! 6 ones, 3 tens | |
| 20. | Make a Number! 4 tenths and 9 ones | |
| 21. | Show and Tell - Click the number of ten groups and ones: 31 | |
| 22. | Show and Tell - Click the number of ten groups and ones: 56 | |
| 23. | Show and Tell - Click the number of ten groups and ones: 17 | |
| 24. | Show and Tell - Click the number of ten groups and ones: 99 | |
| 25. | Show and Tell - Click the number of ten groups and ones: 26 | |
| 26. | Show and Tell - Click the number of ten groups and ones: 80 | |
| 27. | Tell That Number: Recognise a number from ten and one groupings | |
| 28. | Tell That Number: Recognise a number from ten and one groupings | |
| 29. | Tell That Number: Recognise a number from ten and one groupings | |
| 30. | Tell That Number: Recognise a number from ten and one groupings | |
| 31. | Tell That Number: Recognise a number from ten and one groupings | |
| 32. | Tell That Number: Recognise a number from ten and one groupings | |
| 33. | Tell That Number: Recognise a number from ten and one groupings | |
| 34. | Tell That Number: Recognise a number from ten and one groupings | |
| 35. | Tell That Number: Recognise a number from ten and one groupings | |
| 36. | Tell That Number: Recognise a number from ten and one groupings | |
| 37. | Tell That Number: Recognise a number from ten and one groupings (1) | |
| 38. | Tell That Number: Recognise a number from ten and one groupings (1) | |
| 39. | How many ladybugs? |