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<div class="head"><span class="week">Week 10</span><span class="day">Tuesday</span><span class="topic">Column Subtraction with Borrowing</span></div>
<div class="sec"><div class="sec-head"><span class="sec-n">1</span><span class="sec-t">Warm-up: ±10 Mental Math</span></div><div class="abox" style="background:#e8f5e9;"><p><b>2-min Fluency Warm-up</b> — Mental math: add or subtract 10.</p><div class="mgrid c3"><div class="abox"><p>43 + 10 = <span class="b" style="min-width:4em"></span></p></div><div class="abox"><p>76 − 10 = <span class="b" style="min-width:4em"></span></p></div><div class="abox"><p>52 + 10 = <span class="b" style="min-width:4em"></span></p></div><div class="abox"><p>89 − 10 = <span class="b" style="min-width:4em"></span></p></div></div></div></div>
<div class="sec"><div class="sec-head"><span class="sec-n">2</span><span class="sec-t">Borrow from Tens</span></div><p class="note">If the ones aren't enough, borrow from the tens. Cross out the ten and write the new number above.</p><p class="note">Remember: crossing out the ten means it becomes one less!</p><div class="mgrid c3" style="gap:10px;">
<div class="abox" style="text-align:center;"><div class="colbox" style="display:inline-block; width:50px;"><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">53</span></div><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">- 17</span></div><div style="border-top:2px solid #333; margin:3px 0;"></div><div style="height:3.5em;"></div></div></div>
<div class="abox" style="text-align:center;"><div class="colbox" style="display:inline-block; width:50px;"><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">72</span></div><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">- 28</span></div><div style="border-top:2px solid #333; margin:3px 0;"></div><div style="height:3.5em;"></div></div></div>
<div class="abox" style="text-align:center;"><div class="colbox" style="display:inline-block; width:50px;"><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">61</span></div><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">- 24</span></div><div style="border-top:2px solid #333; margin:3px 0;"></div><div style="height:3.5em;"></div></div></div>
<div class="abox" style="text-align:center;"><div class="colbox" style="display:inline-block; width:50px;"><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">85</span></div><div style="text-align:right; padding:4px 0;"><span style="font-size:17px; font-family:monospace;">- 37</span></div><div style="border-top:2px solid #333; margin:3px 0;"></div><div style="height:3.5em;"></div></div></div>
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<div class="sec"><div class="sec-head"><span class="sec-n">3</span><span class="sec-t">Estimate First!</span></div><div class="abox" style="background:#fff3e0;"><p><b>Estimate First!</b> Round to tens, estimate the difference, then calculate.</p><div class="mgrid c2"><div class="abox"><p><b>53 − 17</b></p><p>Round: 50 − 20 = 30</p><p>Estimate: <span class="b" style="min-width:4em"></span></p><p>Actual: <span class="b" style="min-width:4em"></span></p></div><div class="abox"><p><b>72 − 28</b></p><p>Round: 70 − 30 = 40</p><p>Estimate: <span class="b" style="min-width:4em"></span></p><p>Actual: <span class="b" style="min-width:4em"></span></p></div><div class="abox"><p><b>61 − 24</b></p><p>Round: 60 − 20 = 40</p><p>Estimate: <span class="b" style="min-width:4em"></span></p><p>Actual: <span class="b" style="min-width:4em"></span></p></div><div class="abox"><p><b>85 − 37</b></p><p>Round: 90 − 40 = 50</p><p>Estimate: <span class="b" style="min-width:4em"></span></p><p>Actual: <span class="b" style="min-width:4em"></span></p></div></div></div></div>
<div class="sec"><div class="sec-head"><span class="sec-n">4</span><span class="sec-t">Find the Missing Number</span></div><div class="abox"><p class="note">Find the missing number. Think: what goes in the blank?</p><div class="mgrid c3"><div class="abox"><p>60 − <span class="b" style="min-width:4em"></span> = 25</p></div><div class="abox"><p><span class="b" style="min-width:4em"></span> − 42 = 32</p></div><div class="abox"><p>83 − <span class="b" style="min-width:4em"></span> = 56</p></div><div class="abox"><p><span class="b" style="min-width:4em"></span> − 31 = 52</p></div></div></div></div>
<div class="sec"><div class="sec-head"><span class="sec-n">5</span><span class="sec-t">Step-by-Step Borrowing</span></div><p class="note">Write each step. Show where you borrow.</p><div class="mgrid c2"><div class="abox"><p><b>53 − 17</b></p><p>Ones: 3 − 7? Can't do it!</p><p>Borrow: 53 = 4 tens + 13 ones</p><p>Ones: 13 − 7 = <span class="b" style="min-width:3em"></span></p><p>Tens: 4 − 1 = <span class="b" style="min-width:3em"></span></p><p><b>Answer: </b><span class="b" style="min-width:5em"></span></p></div><div class="abox"><p><b>72 − 28</b></p><p>Ones: 2 − 8? Can't do it!</p><p>Borrow: 72 = 6 tens + 12 ones</p><p>Ones: 12 − 8 = <span class="b" style="min-width:3em"></span></p><p>Tens: 6 − 2 = <span class="b" style="min-width:3em"></span></p><p><b>Answer: </b><span class="b" style="min-width:5em"></span></p></div></div></div>
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