EXT K-2 Sampler

21 39 ©Math Teachers Press, Inc., Reproduction by anymeans is strictly prohibited. TENS ONES 62 – 38 TENS ONES First build the larger number. Then remove the smaller number. TENS ONES Now, you can remove 8 ones and 3 tens. Record the problem this way. 62 – 38 24 1. 54 – 26 5. 73 – 17 2. 83 – 18 6. 80 – 27 3. 94 – 21 7. 56 – 38 4. 60 – 16 8. 74 – 35 9. Fred’s book has 85 pages. He read 38 pages. How many pages does he have left to read? __________ 11. 10. Marco’s book has 72 pages. Sally’s book has 86 pages. Howmanymore pages are there in Sally’s book? __________ SubtractionwithRegrouping There are not enough ones… Exchange 1 ten for 10 ones. You are reading amystery book with 62 pages.You have read 38 pages. Howmany pages do you have left to read? Jake subtracted62 –25 and got theanswer 43. Explain inwords, pictures, andwriting if Jake’s answer is correct or incorrect. DISCUSSION Solve. Show the regrouping. StudentActivityPage Step5 StudentActivityBook After the teacher and studentsuseblocks todiscover thepattern, the student sees pictures and symbols at the topof thepage. DISCUSSION Students areasked toexplain inwords, pictures, andwriting if Jake’s answer is correct or incorrect ProblemSolving Research indicates that students taught withmanipulatives arebetter able to apply their conceptual understanding inproblem solving situations and score higher onachievement tests. (Seepage7 of Sampler.) 39 ©Math Teachers Press, Inc., Reproduction by anymeans is strictly prohibited. TENS ONES 62 – 38 TENS ONES First build the larger number. Then remove the smaller number. TENS ONES Now, you can remove 8 ones and 3 tens. Record the problem this way. 62 – 38 24 1. 54 – 26 5. 73 – 17 2. 83 – 18 6. 80 – 27 3. 94 – 21 7. 56 – 38 4. 60 – 16 8. 74 – 35 9. Fred’s book has 85 pages. He read 38 pages. How many pages does he have left to read? __________ 11. 10. Marco’s book has 72 pages. Sally’s book has 86 pages. Howmanymore pages are there in Sally’s book? __________ SubtractionwithRegrouping There are not enough ones… Exchange 1 ten for 10 ones. You are reading amystery book with 62 pages.You have read 38 pages. Howmany pages do you have left to read? Jake subtracted 62 – 25 and got the answer 43. Explain inwords, pictures, andwriting if Jake’s answer is correct or incorrect. DISCUSSION Solve. Show the regrouping.